Developer utilities
Pure calculations, done in your browser: nothing you type here is sent to our server or anyone else's.
14 tools
- IP Address ValidatorIn your browserCheck whether an address is valid, and what kind of address it is.
- Reserved IP RangesIn your browserPrivate, CGNAT, documentation and other special-purpose blocks, with a checker.
- Bulk IP LookupValidate and look up up to 100 addresses at once.
- IPv6 Compress & ExpandIn your browserCanonical short form (RFC 5952) and full form of IPv6 addresses.
- IPv4 to IPv6In your browserIPv4-mapped, 6to4 and NAT64 representations.
- MAC Address LookupThe vendor a MAC address prefix is registered to (IEEE).
- IP Range to CIDRIn your browserConvert an address range into the smallest set of CIDR blocks.
- CIDR CalculatorIn your browserNetwork, broadcast, masks and host counts for any prefix.
- Subnet CalculatorIn your browserSplit networks into subnets, IPv4 and IPv6.
- IP ConverterIn your browserBinary, hex, integer, expanded and reverse forms of an address.
- IP to Decimal ConverterIn your browserAn IPv4 or IPv6 address as one integer.
- Decimal to IP ConverterIn your browserAn integer back to its IPv4 or IPv6 address.
- IP Overlap CheckerIn your browserFind overlapping networks in a list of CIDR blocks.
- User-Agent ParserIn your browserBrowser, engine, operating system and device from a user-agent string.