IP Lens tools

CIDR lookup

Classless Inter-Domain Routing (CIDR) notation describes an IP address block with a network address and prefix length.

Enter an IP prefix in CIDR notation

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The same search also accepts organization names, ASN handles, IPv4 and IPv6 addresses, IP prefixes, and AS numbers.

Popular results

Popular IP range lookups

8.8.8.0/24

Google public DNS range · AS15169

8.8.4.0/24

Google public DNS range · AS15169

1.1.1.0/24

Cloudflare public DNS range · AS13335

1.0.0.0/24

Cloudflare public DNS range · AS13335

9.9.9.0/24

Quad9 public DNS range · AS19281

149.112.112.0/24

Quad9 public DNS range · AS19281

208.67.222.0/24

OpenDNS public DNS range · AS36692

208.67.220.0/24

OpenDNS public DNS range · AS36692

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IP ranges and CIDR

Learn how prefix lengths define the size and boundaries of a range.

IPv4 and IPv6 addresses

Compare address formats and how prefixes work with each version.