Skip to content
The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

Page permalink

Always use the following permalink when referencing this page. It will remain unchanged in future help versions.

https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=3b1a1876-ea95-4f75-8dd9-ad581c0b4aa2

DNS

The Domain Name System (DNS) translates human-friendly computer hostnames into numerical IP addresses (like a phone book for the internet).

Example

www.example.com might translate to the IP addresses 93.184.216.34 (IPv4) and 2606:2800:220:1:248:1893:25c8:1946 (IPv6).

DNS records can be quickly updated, which allows a service's location on the network to change without affecting the users, who continue to use the same hostname.