Cisco Tips & Tricks

July 6, 2006

Subnet Mask Cheat Sheet

Filed under: Router — ciscotips @ 3:25 pm

Subnet Cheat Sheet

 


Hosts

Netmask

Amount of a Class C

/30

4

255.255.255.252

1/64

/29

8

255.255.255.248

1/32

/28

16

255.255.255.240

1/16

/27

32

255.255.255.224

1/8

/26

64

255.255.255.192

1/4

/25

128

255.255.255.128

1/2

/24

256

255.255.255.0

1

/23

512

255.255.254.0

2

/22

1024

255.255.252.0

4

/21

2048

255.255.248.0

8

/20

4096

255.255.240.0

16

/19

8192

255.255.224.0

32

/18

16384

255.255.192.0

64

/17

32768

255.255.128.0

128

/16

65536

255.255.0.0

256

 


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7 Comments »

  1. /25 is missing is there any reason ?????

    Comment by karthikkumar — July 10, 2006 @ 5:00 am

  2. Thanks Kartik!

    I have updated the post.

    -Sikandar

    Comment by Sikandar — July 10, 2006 @ 8:11 am

  3. Nice tip, for those looking for additional subnetting help
    http://www.ciscohq.com/forums/cisco-tips-and-faqs/t-cisco-subnetting-made-easy-292.html
    this may be worth a look.

    Comment by Cisco Forum — September 18, 2006 @ 7:00 pm

  4. I am going to include your forum under my links .. Nice stite!

    Comment by Sikandar — September 19, 2006 @ 2:23 am

  5. i want to see the 0 and 1 of the IP addresses

    Comment by Mawuena Sarbah — October 9, 2009 @ 11:13 am

  6. Has the subnetting changed?
    From what I remember the number of hosts is not correct.

    You have the block size.

    Number of hosts = (Block Size) -2
    Because one address is for the Subnet, (First host is after the Subnet address) and the other is the (Broadcast address).

    Please advise?

    Comment by John Kovalchick — October 4, 2010 @ 1:28 am

  7. That is mentalism tricks revealed what psychics mostly use
    when they put the object is.

    Comment by answer — August 12, 2014 @ 11:23 am


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