Most DNS servers on the Internet run Berkeley Internet Name Domain (BIND) software and run
on Unix or Linux servers. Internal networks can use BIND, but in Microsoft networks, most DNS
servers use the Microsoft DNS software.
Zone Transfer: Occasionally, DNS servers share information with each other in This process
In most cases, a zone transfer only includes a small number of updated records. However,
some transfers include all the records in the zone.
DNS servers use TCP port 53 for zone transfers. In
contrast, name resolution queries use UDP port 53.