# Nexabit Network Utilities > Nexabit Network Utilities is a free, open-source platform with 38 professional networking, DNS, SSL, security, and developer tools. Browser tools are free; the Developer API offers free and paid monthly plans. Built by Nexabit IT Solutions. ## Entity model - Product: Nexabit Network Utilities (https://network.nexabitit.com) - Company: Nexabit IT Solutions (https://nexabitit.com) - Tool count: 38 free browser utilities - Developer API: gated access with free (₹0) and paid monthly plans — keys after login at /developers/login - Browser tools: free, no login required ## Key pages - [Home](https://network.nexabitit.com/) - [All tools](https://network.nexabitit.com/tools) — 38 utilities - [Developers](https://network.nexabitit.com/developers) — API overview and pricing teaser - [Developer login](https://network.nexabitit.com/developers/login) — API key access - [Workspace](https://network.nexabitit.com/workspace) — local recent checks and watchlists - [Team](https://network.nexabitit.com/team) — MSP exports (Growth/Team plans) - [API documentation](https://network.nexabitit.com/api-docs) - [Guides](https://network.nexabitit.com/guides) — how-to articles for SEO/AEO - [Changelog](https://network.nexabitit.com/changelog) ## Categories - [Investigate IPs and connectivity](https://network.nexabitit.com/category/networking): IP lookup, subnetting, ping, traceroute, port checks, WHOIS, and ASN utilities for connectivity troubleshooting. - [Verify DNS and email records](https://network.nexabitit.com/category/dns): DNS lookup, propagation, MX, SPF, DKIM, and DMARC workflows for domain and email authentication validation. - [Inspect certificates and trust](https://network.nexabitit.com/category/ssl): SSL inspection, certificate expiry, PEM decoding, and CSR generation for TLS trust validation. - [Validate credentials and tokens](https://network.nexabitit.com/category/security): Password generation, hashing, JWT decoding, Base64, and UUID tools for credential and token workflows. - [Parse and transform payloads](https://network.nexabitit.com/category/developer): JSON, YAML, regex, cURL, and webhook utilities to accelerate API and payload workflows. - [Validate infrastructure syntax](https://network.nexabitit.com/category/devops): chmod, cron, Docker Compose, and Kubernetes validators for deployment readiness checks. ## Tools - [IP Lookup](https://network.nexabitit.com/tools/ip-lookup): Look up geolocation and network information for any IPv4 or IPv6 address. - [CIDR / Subnet Calculator](https://network.nexabitit.com/tools/cidr-calculator): Calculate subnet masks, network ranges, broadcast addresses, and host counts. - [IPv4 Validator](https://network.nexabitit.com/tools/ipv4-validator): Validate IPv4 addresses and check if they are public, private, or reserved. - [IPv6 Validator](https://network.nexabitit.com/tools/ipv6-validator): Validate IPv6 addresses and expand compressed notation. - [Port Checker](https://network.nexabitit.com/tools/port-checker): Check if a TCP port is open on a remote host. - [Ping](https://network.nexabitit.com/tools/ping): Send ICMP echo requests to test host reachability and latency. - [Traceroute](https://network.nexabitit.com/tools/traceroute): Trace the network path to a destination host. - [WHOIS Lookup](https://network.nexabitit.com/tools/whois): Query WHOIS records for domains and IP address blocks. - [ASN Lookup](https://network.nexabitit.com/tools/asn-lookup): Look up Autonomous System Number details for an IP or ASN. - [HTTP Security Headers Checker](https://network.nexabitit.com/tools/http-security-headers): Analyze HSTS, CSP, X-Frame-Options, and other security headers for any URL. - [DNS Lookup](https://network.nexabitit.com/tools/dns-lookup): Query A, AAAA, MX, TXT, NS, SOA, PTR, and SRV records. - [SPF Checker](https://network.nexabitit.com/tools/spf-checker): Parse and validate SPF records for email authentication. - [DKIM Checker](https://network.nexabitit.com/tools/dkim-checker): Look up DKIM selector records for a domain. - [DMARC Checker](https://network.nexabitit.com/tools/dmarc-checker): Retrieve and parse DMARC policy records. - [DNS Propagation](https://network.nexabitit.com/tools/dns-propagation): Check DNS record propagation across global resolvers. - [Bulk DNS Lookup](https://network.nexabitit.com/tools/bulk-dns-lookup): Look up DNS records for multiple domains from a list or CSV upload. - [SSL Checker](https://network.nexabitit.com/tools/ssl-checker): Inspect SSL/TLS certificates for a hostname. - [SSL Expiry Checker](https://network.nexabitit.com/tools/ssl-expiry): Check certificate expiration dates and days remaining. - [SSL Expiry Monitor](https://network.nexabitit.com/tools/ssl-expiry-monitor): Track multiple hostnames and alert when certificates are expiring soon. - [CSR Generator](https://network.nexabitit.com/tools/csr-generator): Generate a Certificate Signing Request and private key. - [PEM Decoder](https://network.nexabitit.com/tools/pem-decoder): Decode PEM-encoded certificates and keys to inspect details. - [Password Generator](https://network.nexabitit.com/tools/password-generator): Generate secure random passwords with customizable options. - [Password Strength Checker](https://network.nexabitit.com/tools/password-strength): Analyze password strength and get improvement suggestions. - [Hash Generator](https://network.nexabitit.com/tools/hash-generator): Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes. - [JWT Decoder](https://network.nexabitit.com/tools/jwt-decoder): Decode and inspect JSON Web Token headers and payloads. - [Base64 Encode / Decode](https://network.nexabitit.com/tools/base64): Encode or decode text and data using Base64. - [URL / HTML Encode & Decode](https://network.nexabitit.com/tools/url-encoder): Encode or decode URL components and HTML entities. - [UUID Generator](https://network.nexabitit.com/tools/uuid-generator): Generate RFC 4122 version 4 UUIDs. - [JSON Formatter](https://network.nexabitit.com/tools/json-formatter): Format, validate, and minify JSON data. - [YAML Formatter](https://network.nexabitit.com/tools/yaml-formatter): Format and validate YAML documents. - [XML Formatter](https://network.nexabitit.com/tools/xml-formatter): Format and validate XML documents. - [Regex Tester](https://network.nexabitit.com/tools/regex-tester): Test regular expressions against sample text with match highlighting. - [cURL Generator](https://network.nexabitit.com/tools/curl-generator): Build cURL commands from HTTP request parameters. - [Webhook Tester](https://network.nexabitit.com/tools/webhook-tester): Send test HTTP requests to webhook endpoints. - [chmod Calculator](https://network.nexabitit.com/tools/chmod-calculator): Convert between numeric and symbolic Unix file permissions. - [Cron Expression Generator](https://network.nexabitit.com/tools/cron-generator): Build and explain cron schedule expressions. - [Docker Compose Validator](https://network.nexabitit.com/tools/docker-compose-validator): Validate Docker Compose YAML syntax and structure. - [Kubernetes YAML Validator](https://network.nexabitit.com/tools/kubernetes-yaml-validator): Validate Kubernetes manifest YAML files. ## Developer API - Base: https://network.nexabitit.com/api/v1 - Free plan: 10,000 requests/month, 2 RPS, 1 API key - Paid plans: Starter ₹999, Growth ₹2,999, Team ₹7,999, Enterprise custom - Auth: X-API-Key header after key creation at /developers/login - DNS: GET /api/v1/dns/lookup?domain=example.com&type=A - SSL: GET /api/v1/ssl/check?hostname=example.com - IP: GET /api/v1/network/ip-lookup?ip=8.8.8.8 ## Guides - [How to get an API key](https://network.nexabitit.com/guides/how-to-get-api-key) - [How free API access works](https://network.nexabitit.com/guides/how-free-api-access-works) - [Monitor SSL expiry](https://network.nexabitit.com/guides/how-to-monitor-ssl-expiry) - [Troubleshoot DNS propagation](https://network.nexabitit.com/guides/how-to-troubleshoot-dns-propagation) ## Contact - Company: [Nexabit IT Solutions](https://nexabitit.com) - Source: [GitHub](https://github.com/nexabitit/nexabit-networking)