Network
IPv4 Subnet Calculator
Calculate subnet masks, network ranges, and broadcast addresses from CIDR.
IPv4 Address Converter
Convert IPv4 addresses between decimal, hex, and binary formats.
IPv4 Range Expander
Expand IPv4 ranges into address lists and counts.
IPv6 Parser / Expander
Parse, compress, and expand IPv6 addresses.
TLS Version Checker
Check TLS/SSL version, certificate details, and cipher suite for any hostname
IPv6 ULA Generator
Generate RFC 4193 IPv6 Unique Local Addresses (fd00::/8) for private networks. Derived from MAC + NTP time via SHA-1.
MAC Address Vendor Lookup (OUI)
Look up the manufacturer of any MAC address using the IEEE OUI registry. 39,000+ entries, all queried locally.