Classless Inter-Domain Routing (CIDR) Tools

Everything about this Classless Inter-Domain Routing address block

Base information

Address Block 240.0.0.0/4
First address 240.0.0.0
Last address 255.255.255.255
Hosts in range 268 435 456
Mask bits 4

IANA Special-Purpose Registry

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

Address Block 240.0.0.0/4
Purpose Reserved
Allocation Date August 1989
Termination Date N/A
Source false
Destination false
Forwardable false
Globally Reachable false
Reserved by protocol true
Defined in RFC [RFC1112], Section 4

REST API

REST API on request

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CIDR information and calculator

Analyze a CIDR

Example: 127.0.0.0/8 or 2001:db8::/32