bind strange udp ports

[Stella Korakaki]

Hi, 

I'm running bind 9.4.2 and I've noticed that when bind starts, it binds
in two different sequential udp ports.(udp, udp6). For example:


udp        0      0 0.0.0.0:32827           0.0.0.0:*
20546/named         
udp6       0      0 :::32828                :::*
20546/named 


Does anyone know what is the purpose of these two ports and how I can
disable them?


thanks