Too Many UDP serving Ports 2008 server in SBS2011

[syed Maz]

Server 2008 R2, DNS.exe taking around 5000 system socket ports, it that normal?
UDP ports listening from 59632 to 64662 around 5000 ports ????

UDP [::]:64574 *:* 1700
[dns.exe]
UDP [::]:64575 *:* 1700
[dns.exe]
UDP [::]:64576 *:* 1700
[dns.exe]
UDP [::]:64577 *:* 1700
[dns.exe]
UDP [::]:64578 *:* 1700
[dns.exe]
UDP [::]:64579 *:* 1700
[dns.exe]
UDP [::]:64580 *:* 1700
[dns.exe]
UDP [::]:64581 *:* 1700
[dns.exe]
UDP [::]:64582 *:* 1700
[dns.exe]
UDP [::]:64583 *:* 1700
[dns.exe]
UDP [::]:64584 *:* 1700
[dns.exe]
UDP [::]:64585 *:* 1700
[dns.exe]
UDP [::]:64586 *:* 1700
[dns.exe]
UDP [::]:64587 *:* 1700
[dns.exe]
UDP [::]:64588 *:* 1700
[dns.exe]
UDP [::]:64589 *:* 1700
[dns.exe]
UDP [::]:64590 *:* 1700
[dns.exe]
UDP [::]:64591 *:* 1700
[dns.exe]
UDP [::]:64592 *:* 1700
[dns.exe]
UDP [::]:64593 *:* 1700
[dns.exe]
UDP [::]:64594 *:* 1700
[dns.exe]
UDP [::]:64595 *:* 1700
[dns.exe]
UDP [::]:64596 *:* 1700
[dns.exe]
UDP [::]:64597 *:* 1700
[dns.exe]
UDP [::]:64598 *:* 1700
[dns.exe]
UDP [::]:64599 *:* 1700
[dns.exe]
UDP [::]:64600 *:* 1700
[dns.exe]
UDP [::]:64601 *:* 1700
[dns.exe]
UDP [::]:64602 *:* 1700
[dns.exe]
UDP [::]:64603 *:* 1700
[dns.exe]
UDP [::]:64604 *:* 1700
UDP [::]:64624 *:* 1700
[dns.exe]
UDP [::]:64625 *:* 1700
[dns.exe]
UDP [::]:64626 *:* 1700
[dns.exe]
UDP [::]:64627 *:* 1700
[dns.exe]
UDP [::]:64628 *:* 1700
[dns.exe]
UDP [::]:64629 *:* 1700
[dns.exe]
UDP [::]:64630 *:* 1700
[dns.exe]
UDP [::]:64631 *:* 1700
[dns.exe]
UDP [::]:64632 *:* 1700


Is it ok or it is not normal procedure, I understand that DNS has to choose a random port which is working fine using "netstat -anb | find/C "dns.exe"" , showing only one socket port. But is that ok to reserve 5000 ports ?

Thanks