| Port No | 53 |
| Service Name | DNS |
| RFC Doc | 0 |
| Protocol | UDP |
| Description | Domain Name Server (DNS).DNS servers offer different services on TCP and UDP. TCP is used for "zone transfers" of full name record databases, while UDP is used for individual lookups. Security Concerns: Zone Transfers give away entire network maps; high value to attackers. - DNS (BIND) is a popular target, since DNS servers must exist, must be reachable, and exploits usually result DOS or root. Keep BIND version/patches current (refer to www.isca.org). Use "split-DNS" ) |
| Reference Link | Port No- 53: UDP: Domain TCP-IP, UDP-IP, TCP, UDP Ports DNS Related RFC's |
| Attack | No |
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