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Network Cheat Sheet - Quick

IPs / Subnets

Classes

Class Bits Network Broadcast Netmask Prefix Size
Class A 0— 0.0.0.0 127.255.255.255 255.0.0.0 /8
Class B 10– 128.0.0.0 191.255.255.255 255.255.0.0 /16
Class C 110- 192.0.0.0 223.255.255.255 255.255.255.0 /24
Class D 1110 224.0.0.0 239.255.255.255    
Class E 1111 240.0.0.0 255.255.255.255    

Private Ranges

10.0.0.0 10.255.255.255 class A - Private
172.16.0.0 172.31.255.255 class B - Private
192.168.0.0 192.168.255.255 class C - Private
127.0.0.0 127.255.255.255 loopback range

Subnet Calculator

Common Ports

20/21 FTP
22 SSH
23 Telnet
25 SMTP
53 DNS
67 DHCP Server (UDP)
68 DHCP Client (UDP)
69 TFTP (UDP)
70 Gopher
79 Finger
80 HTTP
110 POP3
119 NNTP
123 NTP
143 IMAP
161 SNMP
179 BGP
194 IRC
389 LDAP
443 HTTPS
500 ISAKMP
8080 Web
3306 MySQL
3389 RDP
5800 VNC
5900 VNC