Subnet Table For IPv4 Cheat Sheet

A Programming › Network cheat sheet in English by danh

Subnet Table For IPv4. Expands on "Network Lesson Cheat Sheet by monsieur_h"

54,855 views 14,818 downloads 14 Jan 2012 History

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Subnet Range - Class A

Type	Hosts	Netmask	Hex Value
/1	2048 M	128.0.0.0	80.00.00.00
/2	1024 M	192.0.0.0	C0.00.00.00
/3	512 M	224.0.0.0	E0.00.00.00
/4	256 M	240.0.0.0	F0.00.00.00
/5	128 M	248.0.0.0	F8.00.00.00
/6	64 M	252.0.0.0	FC.00.00.00
/7	32 M	254.0.0.0	FE.00.00.00
/8	16 M	255.0.0.0	FF.00.00.00

Subnet Range - Class B

Type	Host	Netmask	Hex Value
/9	8 M	255.128.0.0	FF.80.00.00
/10	4 M	255.192.0.0	FF.C0.00.00
/11	2 M	255.224.0.0	FF.E0.00.00
/12	1024 K	255.240.0.0	FF.F0.00.00
/13	512 K	255.248.0.0	FF.F8.00.00
/14	256 K	255.252.0.0	FF.FC.00.00
/15	128 K	255.254.0.0	FF.FE.00.00
/16	64 K	255.255.0.0	FF.FF.00.00

Subnet Range - Class C

Type	Hosts	Netmask	Hex Value
/17	32 K	255.255.128.0	FF.FF.80.00
/18	16 K	255.255.192.0	FF.FF.C0.00
/19	8 K	255.255.224.0	FF.FF.E0.00
/20	4 K	255.255.240.0	FF.FF.F0.00
/21	2 K	255.255.248.0	FF.FF.F8.00
/22	1 K	255.255.252.0	FF.FF.FC.00
/23	512	255.255.254.0	FF.FF.FE.00
/24	256	255.255.255.0	FF.FF.FF.00
/25	128	255.255.255.128	FF.FF.FF.80
/26	64	255.255.255.192	FF.FF.FF.C0
/27	32	255.255.255.224	FF.FF.FF.E0
/28	16	255.255.255.240	FF.FF.FF.F0
/29	8	255.255.255.248	FF.FF.FF.F8
/30	4	255.255.255.252	FF.FF.FF.FC
/31	2	255.255.255.254	FF.FF.FF.FE
/32	1	255.255.255.255	FF.FF.FF.FF

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Comments (2)

Pete 13:35 13 Feb 2014

Nice format. I would suggest as a possible addition the list of the RFC 1918 addresses in there too (10,x.x.x, 192.168.x.x, etc) because i always forget the other non-routable IP addresses I can use in a lab environment, and EVERYbody uses 10.x.x.x on their intranets.

DaveChild 08:07 18 Jan 2012

Very handy, thanks. I'm always forgetting these when working with IPTables :)