HTTPfy

Port 3208 (pfu-prcallback)

IANA assigns port 3208 to pfu-prcallback: PFU PR Callback.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pfu-prcallback TCP PFU PR Callback Tetsuharu Hanada -
pfu-prcallback UDP PFU PR Callback Tetsuharu Hanada -

Check what is listening on port 3208

Linux: is anything listening on TCP 3208?
sudo ss -tlnp 'sport = :3208'
Linux: UDP 3208
sudo ss -ulnp 'sport = :3208'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3208
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3208 '
Windows (Command Prompt)
netstat -ano | findstr :3208
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3208 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3208
From Windows
Test-NetConnection HOST -Port 3208
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3208

Block port 3208 in the firewall

ufw
sudo ufw deny 3208/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3208 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3208 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3208' -Direction Inbound -Protocol TCP -LocalPort 3208 -Action Block
ufw
sudo ufw deny 3208/udp
iptables
sudo iptables -A INPUT -p udp --dport 3208 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3208 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3208' -Direction Inbound -Protocol UDP -LocalPort 3208 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.