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Appendix 5

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verickle's version from 2016-11-01 20:13

IP Address Classes

Address ClassValue in First OctetClassful Mask (Dotted Decimal)Classful Mask (Prefix Notation)
Class A1-126255.0.0.0/8
Class B128-191255.255.0.0/16
Class C192-223255.255.255.0/24
Class D224-239
Class E240-255
memorize

Private IP Networks

Address ClassAddress RangeDefault Subnet Mask
Class A10.0.0.0–10.255.255.255255.0.0.0
Class B172.16.0.0–172.31.255.255255.255.0.0
Class C192.168.0.0–192.168.255.255255.255.255.0
memorize

Dotted-Decimal and Prefix-Notation Representations for IPv4 Subnets

Dotted-Decimal NotationPrefix Notation
255.0.0.0/8 (Classful subnet mask for Class A networks)
255.128.0.0/9
255.192.0.0/10
255.224.0.0/11
255.240.0.0/12
255.248.0.0/13
255.252.0.0/14
255.254.0.0/15
255.255.0.0/16 (Classful subnet mask for Class B networks)
255.255.128.0/17
255.255.192.0/18
255.255.224.0/19
255.255.240.0/20
255.255.248.0/21
255.255.252.0/22
255.255.254.0/23
255.255.255.0/24 (Classful subnet mask for Class C networks)
255.255.255.128/25
255.255.255.192/26
255.255.255.224/27
255.255.255.240/28
255.255.255.248/29
255.255.255.252/30
memorize

Subnet Octet Values

Subnet Octet ValueNumber of Contiguous Left-Justified Ones
00
1281
1922
2243
2404
2485
2526
2547
2558
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Number of Supported Hosts Given a Specified Number of Host Bits

Host BitsNumber of Supported Hosts (2h - 2, Where h Is the Number of Borrowed Bits)
22
36
414
530
662
7126
8254
9510
101022
112046
124094
memorize

Usable IP Address Ranges for the 192.168.10.0/27 Subnets

Network AddressDirected Broadcast AddressUsable IP Addresses
192.168.10.0192.168.10.31192.168.10.1–192.168.10.30
192.168.10.32192.168.10.63192.168.10.33–192.168.10.62
192.168.10.64192.168.10.95192.168.10.65–192.168.10.94
192.168.10.96192.168.10.127192.168.10.97–192.168.10.126
192.168.10.128192.168.10.159192.168.10.129–192.168.10.158
192.168.10.160192.168.10.191192.168.10.161–192.168.10.190
192.168.10.192192.168.10.223192.168.10.193–192.168.10.222
192.168.10.224192.168.10.255192.168.10.225–192.168.10.254
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