wireproxy listen a random udp port

[kousyougi]

[Interface]
Address =
PrivateKey =
DNS = 1.1.1.1

[Peer]
PublicKey =
Endpoint =

[Socks5]
BindAddress = 0.0.0.0:8080

I only listen one port for socks5
But when I check "netstat -tulpn"
There are random udp port listening
for example:
udp 0 0 0.0.0.0:35328 0.0.0.0:* 17632/wireproxy
udp 0 0 :::35328 :::* 17632/wireproxy

What do these udp port listen for ?

Thanks

[fmierlo]

This is the wireguard port.