# Teksolvr — Free Online IT Tools & AI IT Specialist Assistants
> Teksolvr is a high-performance web platform providing 97+ free browser-based IT utilities and 12 role-specific AI IT assistants for network engineers, sysadmins, software developers, and cybersecurity analysts.

## Summary & Core Features
- Domain: https://teksolvr.com
- Platform Type: Free Web Utilities & AI IT Support Specialists
- Pricing: 100% Free (No account, signup, or credit card required)
- Execution Model: 100% Client-Side Privacy for Calculators/Generators/Decoders; RFC-compliant Edge APIs for Network Lookups
- Supported Languages: English (en), Spanish (es), German (de), French (fr), Japanese (ja)

## Full Documentation & Knowledge Base
- [Full LLM Specification & Tool Index](https://teksolvr.com/llms-full.txt): Complete breakdown of all 97 tools, capabilities, and diagnostic algorithms.
- [All Online Tools Hub](https://teksolvr.com/en/tools): Categorized index of network, security, developer, email, and cloud tools.
- [All AI IT Assistants](https://teksolvr.com/en/ai-tools): Role-tuned AI assistants for network, security, cloud, Linux, and Windows troubleshooting.
- [Technical Blog & Guides](https://teksolvr.com/en/blog): Deep-dive engineering guides on CIDR subnetting, SSL certificates, BGP routing, SPF/DMARC, and JWT security.
- [Competitor Comparisons](https://teksolvr.com/en/compare): Detailed comparison matrices for Teksolvr vs MXToolbox, CyberChef, DNSChecker, and IP Chicken.

## Tool Categories & Key Utilities (97+ Utilities)
### Network & IP Tools Tools (22)
  - [IP Address Lookup](https://teksolvr.com/en/tools/ip-lookup): Find geographic location, ISP, and network details for any public IP address.
  - [DNS Records Lookup](https://teksolvr.com/en/tools/dns-lookup): Query DNS servers to find A, AAAA, MX, CNAME, TXT, and NS records.
  - [Whois Domain Search](https://teksolvr.com/en/tools/whois-lookup): Retrieve domain registration info, expiry dates, registrar info, and owners.
  - [Ping & Traceroute](https://teksolvr.com/en/tools/ping-traceroute): Check latency, estimate packet loss, and trace route hops to any host.
  - [Port Scanner](https://teksolvr.com/en/tools/port-scanner): Scan standard ports to audit security profiles of active host domains.
  - [Subnet & CIDR Calculator](https://teksolvr.com/en/tools/subnet-calculator): Compute host boundaries, usable ranges, masks, and network IDs.
  - [BGP / ASN Lookup](https://teksolvr.com/en/tools/asn-lookup): Identify ASN registrar networks, upstream peers, and IP block allocations.
  - [MAC Address / OUI Lookup](https://teksolvr.com/en/tools/mac-lookup): Determine manufacturer, hardware vendor, and device type allocations.
  - [IPv4 ↔ IPv6 Converter](https://teksolvr.com/en/tools/ip-converter): Convert IP address representations between expanded, compressed, and mapped forms.
  - [Open Port Checker](https://teksolvr.com/en/tools/open-port-checker): Audit status of specific listening ports on target servers or networks.
  - [IPv6 Subnet Calculator](https://teksolvr.com/en/tools/ipv6-subnet-calculator): Compute host boundaries, ranges, and subnets for IPv6 allocations.
  - [IP Range Calculator](https://teksolvr.com/en/tools/ip-range-calculator): Convert arbitrary IP ranges (start-end) into CIDR blocks.
  - [VLSM Subnet Calculator](https://teksolvr.com/en/tools/vlsm-calculator): Allocate variable length subnet masks based on required hosts.
  - [Supernet & CIDR Aggregator](https://teksolvr.com/en/tools/supernet-calculator): Summarize multiple IP ranges and CIDR blocks into a single supernet.
  - [Wildcard Mask Calculator](https://teksolvr.com/en/tools/wildcard-calculator): Calculate wildcard (inverse) masks for Cisco access control lists (ACLs).
  - [MTU & MSS Calculator](https://teksolvr.com/en/tools/mtu-mss-calculator): Calculate TCP Maximum Segment Size (MSS) based on MTU and protocol encapsulation overhead.
  - [Global Ping Tester](https://teksolvr.com/en/tools/global-ping): Ping and check server response latencies from multiple global cities simultaneously.
  - [BGP Route Visualizer](https://teksolvr.com/en/tools/bgp-route-visualizer): Visualize BGP routing paths, autonomous systems (AS), and upstream internet provider hops.
  - [TCP Port Banner Grabber](https://teksolvr.com/en/tools/tcp-banner-grabber): Establish raw TCP connections to query listening services and extract software version banners.
  - [Network Latency Heatmap](https://teksolvr.com/en/tools/network-latency-heatmap): Measure real-time connection latencies to major cloud provider datacenters globally.
  - [WHOIS History Lookup](https://teksolvr.com/en/tools/whois-history): Look up historical WHOIS records to trace administrative changes and ownership timeline.
  - [Bulk Reverse DNS Lookup](https://teksolvr.com/en/tools/reverse-dns-bulk): Resolve lists of IP addresses to their reverse DNS PTR hostnames concurrently in bulk.

### Security Tools Tools (16)
  - [Password Generator](https://teksolvr.com/en/tools/password-generator): Create strong, customizable cryptographically secure passwords.
  - [Password Strength Checker](https://teksolvr.com/en/tools/password-strength): Audit credential health, entropy calculations, and crack time estimates.
  - [Data Breach Checker](https://teksolvr.com/en/tools/breach-checker): Audit if account email identifiers have been exposed in known data leaks.
  - [URL Safety & Malware Scanner](https://teksolvr.com/en/tools/url-scanner): Audit domains and external URLs against malware, phishing, virus payloads, and threat databases.
  - [IP Reputation Checker](https://teksolvr.com/en/tools/ip-reputation): Analyze threat level, spam scores, and abuse logs associated with an IP.
  - [MD5/SHA Hash Generator](https://teksolvr.com/en/tools/hash-generator): Calculate MD5, SHA-1, SHA-256, and SHA-512 values client-side.
  - [File Hash Checker](https://teksolvr.com/en/tools/file-hash-checker): Compute file cryptographic signatures to check integrity against expected hashes.
  - [SSL Certificate Checker](https://teksolvr.com/en/tools/ssl-checker): Verify SSL/TLS installation details, expiry dates, and trust chains of a host.
  - [Full Website Security Scanner](https://teksolvr.com/en/tools/security-scan): Run a deep audit of SSL, headers, open ports, reputation, cookies, and information disclosure.
  - [CVE Vulnerability Checker](https://teksolvr.com/en/tools/vulnerability-checker): Search database records for vulnerabilities matching tech stacks or CVE IDs.
  - [HTTP Security Headers Analyzer](https://teksolvr.com/en/tools/header-security): Validate security header directives and generate server implementation code.
  - [SSL Security Auditor](https://teksolvr.com/en/tools/ssl-security): Examine protocol versions, cipher suite strengths, and HSTS setups.
  - [CORS Security Checker](https://teksolvr.com/en/tools/cors-checker): Test Access-Control headers, credentials allowances, and reflection safety.
  - [CSP Analyzer & Builder](https://teksolvr.com/en/tools/csp-analyzer): Inspect Content Security Policy directives and highlight unsafe options.
  - [DNS Security Analyzer](https://teksolvr.com/en/tools/dns-security): Validate DNSSEC, DMARC/SPF defenses, and check zone transfer availability.
  - [Firewall Rule Generator](https://teksolvr.com/en/tools/firewall-rule-generator): Generate iptables, nftables, ufw, and Windows Firewall rules from a simple form. Export ready-to-paste commands.

### Email & Deliverability Tools (6)
  - [Email Header Analyzer](https://teksolvr.com/en/tools/email-header-analyzer): Paste raw email headers to visualize delivery hops, SPF/DKIM/DMARC authentication results, and detect spoofing.
  - [SPF Record Generator](https://teksolvr.com/en/tools/spf-generator): Build a valid SPF TXT DNS record from IP addresses, domains, and includes. Copy-paste ready output.
  - [DMARC Policy Builder](https://teksolvr.com/en/tools/dmarc-builder): Create a DMARC DNS record with policy level, reporting addresses, and alignment mode. Prevent email spoofing.
  - [DKIM Key Generator](https://teksolvr.com/en/tools/dkim-generator): Generate RSA DKIM key pairs and the DNS TXT record for your mail server. Keys generated securely in-browser.
  - [Email Blacklist Checker](https://teksolvr.com/en/tools/email-blacklist-checker): Check if your domain or IP is listed on major spam blacklists (Spamhaus, Barracuda, SORBS, and 50+ others).
  - [MX Record Propagation Checker](https://teksolvr.com/en/tools/mx-propagation-checker): Verify MX record propagation across 20+ global DNS servers simultaneously. Diagnose mail routing issues.

### Config Generators Tools (5)
  - [Nginx Config Generator](https://teksolvr.com/en/tools/nginx-config-generator): Generate optimized Nginx server blocks for reverse proxies, static sites, PHP, and SSL configurations.
  - [Apache .htaccess Generator](https://teksolvr.com/en/tools/htaccess-generator): Generate .htaccess files for redirects, custom error pages, caching rules, and security policies.
  - [SSH Config Generator](https://teksolvr.com/en/tools/ssh-config-generator): Manage multiple SSH hosts by generating formatted SSH client config files.
  - [SSL/TLS Config Generator](https://teksolvr.com/en/tools/ssl-tls-config-generator): Generate hardened SSL/TLS configurations for Nginx, Apache, or HAProxy based on Mozilla guidelines.
  - [Crontab Validator & Tester](https://teksolvr.com/en/tools/crontab-validator): Validate cron expressions, translate them to human-readable terms, and estimate next run times.

### Certificate Tools Tools (5)
  - [SSH Key Generator](https://teksolvr.com/en/tools/ssh-key-generator): Generate cryptographically secure SSH key pairs (RSA or ECDSA) client-side in your browser.
  - [SSL Certificate Decoder](https://teksolvr.com/en/tools/ssl-certificate-decoder): Decode and inspect X.509 certificates to verify Common Name, Issuer, validity dates, and public key data.
  - [SSL Certificate Converter](https://teksolvr.com/en/tools/ssl-certificate-converter): Convert SSL certificates between PEM (Base64) and DER (binary) formats client-side.
  - [CSR Generator](https://teksolvr.com/en/tools/csr-generator): Generate standard Certificate Signing Requests (CSR) and private keys client-side to request SSL certificates.
  - [Self-Signed Certificate Generator](https://teksolvr.com/en/tools/self-signed-cert-generator): Create local self-signed SSL/TLS certificates and private keys instantly in-browser for development and testing.

### AI-Powered Tools Tools (5)
  - [AI Config File Explainer](https://teksolvr.com/en/tools/config-explainer): Paste server configuration scripts (Nginx, Apache, SSH, Firewall) and get detailed line-by-line explanations in plain English.
  - [AI Error Code Decoder](https://teksolvr.com/en/tools/error-decoder): Paste application error logs, crash details, or exit codes to diagnose root causes and generate step-by-step resolution checklists.
  - [AI Log File Analyzer](https://teksolvr.com/en/tools/log-analyzer): Paste server, container, or web application log blocks to summarize event logs, parse error patterns, and flag system anomalies.
  - [AI Script Explainer](https://teksolvr.com/en/tools/script-explainer): Paste Bash shell scripts, Python, or PowerShell files to analyze operational flows, lines of logic, and inspect security risks.
  - [AI Regular Expression Generator](https://teksolvr.com/en/tools/regex-generator): Describe what text you want to match in plain English and automatically compile valid regex patterns, token guides, and tests.

### Website & Server Tools Tools (5)
  - [Website Uptime Checker](https://teksolvr.com/en/tools/uptime-checker): Audit server status, response headers, and delay parameters.
  - [HTTP Headers Inspector](https://teksolvr.com/en/tools/http-headers): Inspect response headers and verify active browser security metrics.
  - [Redirect Chain Tracer](https://teksolvr.com/en/tools/redirect-tracer): Follow full navigation hops, redirect headers, and detect loops.
  - [Page Speed Analyzer](https://teksolvr.com/en/tools/page-speed): Request Core Web Vitals performance parameters for desktop and mobile.
  - [Broken Link Checker](https://teksolvr.com/en/tools/broken-link-checker): Scan and verify links on a target page for 404s and errors.

### Developer Tools Tools (12)
  - [JSON Formatter & Validator](https://teksolvr.com/en/tools/json-formatter): Format, validate, beautify, and minify JSON data with real-time error highlights.
  - [Base64 Encoder/Decoder](https://teksolvr.com/en/tools/base64): Encode plain text or files to Base64 formats and decode back instantly.
  - [JWT Analyzer & Decoder](https://teksolvr.com/en/tools/jwt-decoder): Parse tokens to audit active headers, claims, payloads, and signatures.
  - [Regex Tester & Debugger](https://teksolvr.com/en/tools/regex-tester): Evaluate regular expressions, capture matches, and check group bindings.
  - [URL Encoder & Decoder](https://teksolvr.com/en/tools/url-encoder): Sanitize query inputs, escape parameters, or decode URL paths.
  - [HTML Entity Converter](https://teksolvr.com/en/tools/html-entity): Escape markup text characters to HTML entities to secure code rendering.
  - [Unix Timestamp Converter](https://teksolvr.com/en/tools/timestamp): Translate epochs to local dates and follow real-time clock tickers.
  - [UUID/GUID Generator](https://teksolvr.com/en/tools/uuid-generator): Generate single or bulk RFC 4122 compliant UUID v1 and v4 keys.
  - [Cron Expression Builder](https://teksolvr.com/en/tools/cron-builder): Construct visual schedules, view human translations, and next execution runs.
  - [Code Beautifier / Minifier](https://teksolvr.com/en/tools/code-formatter): Format and minify HTML, CSS, JavaScript, JSON, and SQL codes in-browser.
  - [Text Diff Checker](https://teksolvr.com/en/tools/diff-checker): Inspect side-by-side block differences, additions, and line alterations.
  - [Markdown to HTML](https://teksolvr.com/en/tools/markdown-converter): Convert markdown text to standard parsed HTML markup code.

### Conversion & Calculation Tools (21)
  - [Number Base Converter](https://teksolvr.com/en/tools/number-converter): Translate integers between binary, octal, decimal, and hexadecimal bases.
  - [File Size Converter](https://teksolvr.com/en/tools/file-size-converter): Convert size volumes between byte increments (KB, MB, GB, TB, PB).
  - [Bandwidth Calculator](https://teksolvr.com/en/tools/bandwidth-calculator): Estimate transfer times for file sizes across varying link network speeds.
  - [RAID Calculator](https://teksolvr.com/en/tools/raid-calculator): Calculate capacity allocations, drive limits, and performance indexes.
  - [HTTP Status Code Reference](https://teksolvr.com/en/tools/http-status-codes): Interactive reference of HTTP headers, protocols, and standard status codes.
  - [Cloud Cost Estimator](https://teksolvr.com/en/tools/cloud-cost-estimator): Estimate VM compute, storage, and outbound egress costs for standard cloud servers.
  - [Multi-Cloud Compute Comparison](https://teksolvr.com/en/tools/multi-cloud-comparison): Compare compute instance specs and costs side-by-side between AWS, Azure, and GCP.
  - [AWS EC2 Instance Cost Calculator](https://teksolvr.com/en/tools/ec2-cost-calculator): Calculate AWS EC2 monthly costs based on region, instance type family, OS, and pricing plans.
  - [Cloud Storage & Egress Cost Estimator](https://teksolvr.com/en/tools/cloud-storage-egress): Compute standard cloud storage, storage tier classes, and monthly egress data transfer fees.
  - [Kubernetes Cluster Cost Calculator](https://teksolvr.com/en/tools/kubernetes-cost): Estimate Kubernetes cluster control plane, worker node compute, storage, and load balancer costs.
  - [Serverless Function Cost Calculator](https://teksolvr.com/en/tools/serverless-cost): Calculate monthly serverless function costs (AWS Lambda, Azure Functions) based on memory and executions.
  - [Reserved vs On-Demand ROI Calculator](https://teksolvr.com/en/tools/reserved-vs-ondemand): Compute the break-even timeline and net savings of purchasing reserved cloud instances vs on-demand.
  - [Cloud Migration TCO Calculator](https://teksolvr.com/en/tools/cloud-migration-calculator): Compare physical on-premises datacenter hosting costs (servers, space, power) vs cloud migration.
  - [Auto Scaling Cost Savings Estimator](https://teksolvr.com/en/tools/autoscaling-cost): Compare dynamically scaling VM clusters vs static peak-provisioned VM infrastructure costs.
  - [FinOps Cost Savings & Ingestion Estimator](https://teksolvr.com/en/tools/finops-savings): Estimate log ingestion costs and identify savings from reclaiming idle compute, load balancers, and unattached disks.
  - [SLA Uptime & Allowed Downtime Calculator](https://teksolvr.com/en/tools/sla-uptime-calculator): Calculate daily, weekly, monthly, and yearly allowed downtime based on SLA uptime percentages.
  - [Error Budget Calculator](https://teksolvr.com/en/tools/error-budget-calculator): Compute allowed error count, remaining budget, and burn rate based on SLO uptime targets.
  - [Server Capacity & Resource Sizing Calculator](https://teksolvr.com/en/tools/server-capacity-calculator): Estimate CPU cores, RAM, and bandwidth resources needed for target peak concurrent users.
  - [Auto Scaling Threshold Calculator](https://teksolvr.com/en/tools/autoscaling-thresholds): Calculate recommended scale-out and scale-in thresholds based on target CPU workload capacities.
  - [Incident Cost Calculator](https://teksolvr.com/en/tools/incident-cost-calculator): Estimate total financial impact of IT downtime including revenue loss, labor overhead, and SLA penalties.
  - [Backup RPO/RTO Calculator](https://teksolvr.com/en/tools/rpo-rto-calculator): Evaluate backup frequencies and system restore rates against target RPO/RTO disaster recovery objectives.

## Specialized AI IT Assistants (12 Specialists)
Role-tuned AI agents trained on specific IT engineering disciplines:
- [IT Expert Assistant](https://teksolvr.com/en/ai-tools/expert): Query our Teksolvr-powered AI specialist for expert advice on server infrastructure, configurations, and IT architecture.
- [Network Engineer AI](https://teksolvr.com/en/ai-tools/network-engineer): Expert advice on enterprise routing protocols, switching, subnetting, QoS, and OSI troubleshooting.
- [IT Desktop Support AI](https://teksolvr.com/en/ai-tools/desktop-support): Troubleshooting steps for Windows, macOS, Linux, driver issues, AD configurations, and desktop hardware.
- [Cybersecurity Analyst AI](https://teksolvr.com/en/ai-tools/cybersecurity-analyst): Assess vulnerability scans, audit threat analysis dashboards, CVE remediations, and defensive hardening.
- [Cloud Engineer AI](https://teksolvr.com/en/ai-tools/cloud-engineer): Design serverless microservices, IAM policies, and infrastructure-as-code deployments (AWS, Azure, GCP).
- [Linux Sysadmin AI](https://teksolvr.com/en/ai-tools/linux-sysadmin): Diagnose system performance, optimize shell scripts, tuning cron schedules, logs, and package systems.
- [Windows Server Admin AI](https://teksolvr.com/en/ai-tools/windows-server-admin): Configure Active Directory domains, IIS web hosts, PowerShell automations, and Hyper-V specs.
- [Database Admin AI](https://teksolvr.com/en/ai-tools/database-admin): Write SQL queries, configure database backups, troubleshoot slow indexes, locks, and replicas.
- [DevOps Engineer AI](https://teksolvr.com/en/ai-tools/devops-engineer): Build CI/CD pipelines, Dockerize application hosts, orchestrate Kubernetes, and write Terraform manifests.
- [Firewall & VPN AI](https://teksolvr.com/en/ai-tools/firewall-vpn): Configure stateful firewall rules, NAT tables, IPsec, OpenVPN, and WireGuard credentials.
- [Wi-Fi & Wireless AI](https://teksolvr.com/en/ai-tools/wifi-wireless): Optimize 802.11 Wi-Fi networks, design channel assignments, roaming configurations, and WPA3 security.
- [M365 Administrator AI](https://teksolvr.com/en/ai-tools/m365-admin): Enterprise identity governance, Graph SDK PowerShell scripting, Conditional Access design, and Purview compliance.

## Reference Data & Cheat Sheets
- [CIDR & Subnet Cheat Sheet](https://teksolvr.com/en/reference/subnet-cheat-sheet): Interactive IPv4/IPv6 CIDR subnet masks, host ranges, and VLSM rules.
- [Port Numbers Cheat Sheet](https://teksolvr.com/en/reference/port-cheat-sheet): Comprehensive reference table for TCP/UDP well-known ports (1-65535).
- [HTTP Status Codes Reference](https://teksolvr.com/en/reference/http-status): RFC 9110 status code definitions, common causes, and Nginx/Apache configs.
- [Secure Server Configurations](https://teksolvr.com/en/reference/secure-configs/nginx): Battle-tested Nginx, Apache, and Cloudflare hardening guidelines.