Networking & IP Tools

The Networking category on ToolNestr provides a professional-grade collection of network calculation, analysis, and diagnostic tools for network administrators, IT professionals, cybersecurity specialists, students, and anyone managing or troubleshooting computer networks. The IP subnet calculator takes an IP address and prefix length and returns the network address, broadcast address, usable host range, and binary representation. The CIDR calculator converts between CIDR notation and subnet masks and shows the full IP range. The VLSM calculator splits a network into variable-length subnets for efficient address allocation. The IPv6 subnet calculator, IPv6 compressor/expander, and IPv4-to-IPv6 converter cover modern IPv6 addressing needs. The subnet mask cheat sheet provides an interactive CIDR-to-hosts reference table you can filter and search. The IP tracker reveals location, ISP, ASN, and timezone for any IP address. The what is

my IP tool shows your public IP, ISP, and browser info. The private vs public IP checker determines if an address is RFC 1918 private or public. The IP binary/hex converter translates addresses between decimal, binary, and hexadecimal. The IP list sorter deduplicates and sorts batches of IP addresses. The DNS lookup tool performs queries for A, AAAA, CNAME, MX, NS, TXT, and SOA records. The reverse DNS lookup finds the hostname for any IP. The WHOIS lookup retrieves domain registration data. The DNS propagation checker verifies record propagation across global resolvers. The DNS record builder generates correctly formatted zone file records. The SPF, DMARC, and blacklist checkers diagnose email deliverability issues. The SSL/TLS certificate checker reports issuer, validity dates, and cipher details for any HTTPS site. The HTTP headers

checker, redirect chain tracer, and uptime checker provide web server diagnostics. The user agent parser, email header analyzer, port checker, ping test, ASN lookup, MAC address lookup, bandwidth calculator, MTU calculator, and bandwidth vs throughput calculator complete the toolkit for full network analysis.