IPv4 Address Classes

#defs_ccna

There are 5 IPv4 Address Classes defined by RFC 1918, each allocated to a specific purpose or consumer.
- NOTE: While occasionally referenced in the CCNA, they are not relevant when it comes to subnetting

Class	Purpose	First Octet	First Octet Range	Slash Subnet	Dotted Subnet	Private IP Range	Private IP Subnet Mask
A - "This Network"	RFC Reserved - "This Network"	0.0.0.0	-	/8	255.0.0.0	0.0.0.0 - 0.255.255.255	---
A	Large networks	1-126	128	/8	255.0.0.0	10.0.0.0 - 10.255.255.255	/8
A - Loopback	RFC Reserved - Loopback	127	-	/8	255.0.0.0	127.0.0.0 - 127.255.255.255	---
B	Medium/Large networks	128-191	64	/16	255.255.0.0	172.16.0.0 - 172.31.255.255	/12
C	Small Networks	192-223	32	/24	255.255.255.0	192.168.0.0 - 192.168.255.255	/16
D	Multicast addresses	224-239	16	---	---	---	---
E	Experimental	240-255	16	---	---	---	---

Metadata