Classless Inter-Domain Routing (CIDR) Tools

Everything about this Classless Inter-Domain Routing address block

Base information

Address Block
First address
Last address
Hosts in range 65 536
Mask bits 16

IANA Special-Purpose Registry

This CIDR is in a special-purpose block reserved by IANA for special purposes.

Address Block
Purpose Link Local
Allocation Date May 2005
Termination Date N/A
Source true
Destination true
Forwardable false
Globally Reachable false
Reserved by protocol true
Defined in RFC [RFC3927]


REST API on request


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CIDR information and calculator

Analyze a CIDR

Example: or 2001:db8::/32