Online Test Banks
Score higher
See Online Test Banks
eLearning
Learning anything is easy
Browse Online Courses
Mobile Apps
Learning on the go
Explore Mobile Apps
Dummies Store
Shop for books and more
Start Shopping

Ports, Protocols, and IP Address Ranges for Firewalls

Part of the Firewalls For Dummies Cheat Sheet

If you’re building or installing a firewall to protect your computer and your data, basic information about Internet configurations can come in very handy. The following tables give you the facts on IP protocols, ports, and address ranges.

Common IP Protocols
Protocol Name
1 ICMP (ping)
6 TCP
17 UDP
47 GRE (PPTP)
50 ESP (IPSec)
51 AH (IPSec)
Common TCP and UDP Ports
Protocol Port Name
TCP 20 FTP data
TCP 21 FTP control
TCP 23 Telnet
TCP 25 SMTP (E-mail)
TCP/UDP 53 DNS query
UDP 67/68 DHCP (Dynamic IP address configuration)
TCP 80 HTTP (Web)
TCP 110 POP3 (E-mail)
TCP 119 NNTP (Newsgroups)
TCP 143 IMAP4 (E-mail)
TCP 389 LDAP (Directory service)
TCP 443 HTTPS (Web SSL)
UDP 1701 L2TP (Virtual Private Networks)
TCP 1723 PPTP (Virtual Private Networks)
Private and Automatic IP Address Ranges
A 10.0.0.0 to 10.255.255.255 (10.0.0.0/8)
B 172.16.0.0 to 172.31.255.255 (172.16.0.0/12)
C 192.168.0.0 to 192.168.255.255 (192.168.0.0/16)
APIPA 169.254.0.0 to 169.254.255.255 (169.254.0.0/16)
  • Add a Comment
  • Print
  • Share
blog comments powered by Disqus

SERIES
Firewalls For Dummies Cheat Sheet

Advertisement

Inside Dummies.com

Dummies.com Sweepstakes

Win $500. Easy.