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Documentation
CCNA Prep- IP Subnetting from Networkers
how-to-subnet-a-network
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IP Address Subnetting Tutorial
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Subnetting Questions
CISCO Recertification
About Recertification
Certification Tracking System
CCNA
CCNP
CCIE R&S
CCIE Security
CCIE Wireless
There is a bug in these calculation scheme for IP A classes. This will appear when the network ID has more than 12 bits allocated for it. And be careful when you will use it in real life.
IP class:
Select IP Class
A[0-126]
B[128-191]
C[192-223]
Netmask:
/8
/9
/10
/11
/12
/13
/14
/15
/16
/17
/18
/19
/20
/21
/22
/23
/24
/25
/26
/27
/28
/29
/30
/31
/32
IP:
Total Subnets:
Total Hosts:
SM:
Subnets to use:
Hosts/Subnet: