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# Private, reserved, or special-purpose?

Paste an IPv4 or IPv6 address — every IANA special-purpose block containing it, with the registry date shown and the verdict worded as what it is: a registry lookup.
IANA special-purpose snapshot 2026-08-24 · checked locallyClassifyClear

Matches the IANA "Shared address space (CGN)" block 100.64.0.0/10 (RFC 6598). The registry marks this block not globally reachable.

 Block IANA name Reference Globally reachable
 100.64.0.0/10 Shared address space (CGN) RFC 6598no

Class A (classful-era label — routing has been classless since CIDR, RFC 4632)

IANA IPv4 and IPv6 Special-Purpose Address Registries (iana.org/assignments), hand-distilled snapshot, snapshot 2026-08-24

IPv4 registry rows

- 0.0.0.0/8This network
- 10.0.0.0/8Private use
- 100.64.0.0/10Shared address space (CGN)
- 127.0.0.0/8Loopback
- 169.254.0.0/16Link-local
- 172.16.0.0/12Private use
- 192.0.0.0/24IETF protocol assignments
- 192.0.2.0/24Documentation (TEST-NET-1)
- 192.88.99.0/24Deprecated (6to4 relay anycast)
- 192.168.0.0/16Private use
- 198.18.0.0/15Benchmarking
- 198.51.100.0/24Documentation (TEST-NET-2)
- 203.0.113.0/24Documentation (TEST-NET-3)
- 240.0.0.0/4Reserved (former class E)
- 255.255.255.255/32Limited broadcast

IPv6 registry rows

- ::/128Unspecified
- ::1/128Loopback
- ::ffff:0:0/96IPv4-mapped
- 64:ff9b::/96IPv4/IPv6 translation (NAT64)
- 100::/64Discard-only
- 2001::/23IETF protocol assignments (includes 2001:db8::/32 documentation)
- 2001:2::/48Benchmarking
- 2001:10::/28Deprecated (ORCHID)
- 2001:20::/28ORCHIDv2
- 2001:db8::/32Documentation
- 2002::/166to4
- fc00::/7Unique-local (ULA)
- fe80::/10Link-local
- ff00::/8Multicast

- Not a routing decision: "not in the snapshot" means commonly treated as public — your own network's routes and filters are the truth there.
- Not a geolocation or reputation lookup — nothing about this address leaves the tab.
- The legacy class A–E label is history (classless since CIDR, RFC 4632); it is included because old docs still use it.
Done

Finished here in the tab. Nothing was uploaded.

every verdict traces to a registry row — snapshot 2026-08-24

## Next door in Network

- [IPv4 subnet calculator](/network/ipv4-subnet)
- [IP number forms](/network/ip-numbers)
[All network tools](/network)

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