IP Address Inspector
Network
Parses a single IP, classifies it (Class A–E for v4; global / link-local / loopback / unique-local / multicast / documentation for v6), and shows every notation you commonly need to paste somewhere: decimal, hex, binary, the IETF `in-addr.arpa` / `ip6.arpa` reverse-DNS form, and the /32 (or /128) CIDR.
- VersionIPv4
- Scopeprivate
- ClassClass C
- Decimal3232235818
- Hex0xC0A8012A
- Binary11000000.10101000.00000001.00101010
- CIDR (/32)192.168.1.42/32
- Reverse DNS42.1.168.192.in-addr.arpa
For CIDR ranges, use the Subnet Calculator instead — this tool focuses on single addresses.
How to use
- Type or paste an IPv4 (`192.168.1.1`) or IPv6 (`fe80::1`, `2001:db8::1`) address.
- Read the scope and class to know what you're looking at.
- Copy the form you need — reverse DNS for PTR records, decimal for a packed integer, binary for subnetting math.
Frequently asked questions
- What does `link-local` mean?
- An address that's only valid inside a single network segment. IPv4 uses 169.254.0.0/16 when a host fails to get a DHCP lease; IPv6 uses fe80::/10 for neighbour discovery and is set automatically by every interface.
- Why are 192.0.2.0, 198.51.100.0, and 203.0.113.0 listed as documentation?
- RFC 5737 reserves those three /24 blocks (and 2001:db8::/32 for IPv6) for examples in documentation and training material — they're guaranteed never to appear on the public internet, which makes them safer than picking a real-looking IP that might exist.
- What's the reverse-DNS form for?
- DNS PTR records — they map an IP back to a hostname. IPv4 reverses the octets and appends `.in-addr.arpa`; IPv6 reverses every hex nibble and appends `.ip6.arpa`. The reverse zones are delegated to whoever owns the address space.
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