Network
IPv4 math without the mental gymnastics.
Subnet ranges, address conversions and CIDR membership — computed in your browser with plain bit math. No lookups, no egress, nothing uploaded.
NET · 01
Subnet Calculator
NewIPv4 ranges from a CIDR.
Runs in your browser · no upload
NET · 02
IP Converter
NewIPv4 as decimal, hex & binary.
Runs in your browser · no upload
NET · 03
IP in CIDR
NewIs an address inside a block?
Runs in your browser · no upload
NET · 04
IPv6 Expand
NewExpand and compress IPv6 addresses.
Runs in your browser · no upload
NET · 05
Port Reference
NewCommon TCP/UDP ports and services.
Runs in your browser · no upload
NET · 06
User-Agent Parser
NewRead a browser User-Agent string.
Runs in your browser · no upload
FAQ
- Do these tools query the network?
- No — they are pure math on the address you enter. Nothing leaves your browser.
- Do they support IPv6?
- Not yet — these cover IPv4 (subnetting, conversion, CIDR membership). IPv6 tools are on the roadmap.