IP Range Checker

Classify an IP address and inspect its private, special-use, and public-range status.

NETWORK & IP · LOCAL WORKBENCH · BROWSER WORKSPACE

Set the inputs. Review the transformation.

Classify an IP address and inspect its private, special-use, and public-range status.

01 · ADDRESS LISTIPv4 · ONE PER LINE

Paste addresses from a router, log, or configuration

Checked in this browserAddresses are not sent to a server. Public means “outside the listed special-use ranges,” not that a host is reachable.

02 · ADDRESS-BY-ADDRESS6 ADDRESSES

01192.168.1.1Private (RFC 1918)192.168.0.0/16

The home router range

02100.64.12.9Carrier-grade NAT100.64.0.0/10

Your ISP’s shared space — neither private nor public

03169.254.7.201Link-local169.254.0.0/16

Self-assigned because DHCP did not answer

048.8.8.8Public

Routable on the internet; confirm current registry allocation before relying on it.

05127.5.5.5Loopback127.0.0.0/8

The whole /8, not just 127.0.0.1

06172.20.5.6Private (RFC 1918)172.16.0.0/12

Runs to 172.31, not 172.16 only

WHAT THIS MEANS2 NOTES

A 100.64.0.0/10 WAN address means your ISP is translating traffic too. Port forwarding on your router cannot create an inbound path through the ISP’s NAT; ask about a public address or use a relay/VPN endpoint.

A 169.254 address usually means DHCP did not answer. The device has no gateway; check the link, switch port, or DHCP pool.

03 · SPECIAL-USE REFERENCE15 RANGES

0.0.0.0/8This networkSource-only, and never a valid destination

10.0.0.0/8Private (RFC 1918)16.7 million addresses — used by anything large

100.64.0.0/10Carrier-grade NATYour ISP’s shared space — neither private nor public

127.0.0.0/8LoopbackThe whole /8, not just 127.0.0.1

169.254.0.0/16Link-localSelf-assigned because DHCP did not answer

172.16.0.0/12Private (RFC 1918)Runs to 172.31, not 172.16 only

192.0.0.0/24IETF protocol useSpecial-purpose assignments

192.0.2.0/24DocumentationTEST-NET-1, for examples — never real

192.168.0.0/16Private (RFC 1918)The home router range

198.18.0.0/15Benchmark testingNetwork device benchmarking

198.51.100.0/24DocumentationTEST-NET-2

203.0.113.0/24DocumentationTEST-NET-3

224.0.0.0/4MulticastA group, never a host

240.0.0.0/4ReservedReserved since 1981 and still is

255.255.255.255/32BroadcastLimited broadcast, this segment only

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Runs in this browser. Results are estimates or editing cues. Review the assumptions and source-specific limits before using them in a consequential decision.

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How this app works

Classify an IP address and inspect its private, special-use, and public-range status. Results update as you adjust inputs and stay in this browser.