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 256
Mask bits 24

IANA Special-Purpose Registry

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

Address Block
Purpose Documentation (TEST-NET-2)
Allocation Date January 2010
Termination Date N/A
Source false
Destination false
Forwardable false
Globally Reachable false
Reserved by protocol false
Defined in RFC [RFC5737]


REST API on request


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CIDR information and calculator

Analyze a CIDR

Example: or 2001:db8::/32