HTTPfy

Port 3163 (res-sap)

IANA assigns port 3163 to res-sap: RES-SAP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
res-sap TCP RES-SAP Bob Janssen -
res-sap UDP RES-SAP Bob Janssen -

Check what is listening on port 3163

Linux: is anything listening on TCP 3163?
sudo ss -tlnp 'sport = :3163'
Linux: UDP 3163
sudo ss -ulnp 'sport = :3163'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3163
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3163 '
Windows (Command Prompt)
netstat -ano | findstr :3163
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3163 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3163
From Windows
Test-NetConnection HOST -Port 3163
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3163

Block port 3163 in the firewall

ufw
sudo ufw deny 3163/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3163 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3163 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3163' -Direction Inbound -Protocol TCP -LocalPort 3163 -Action Block
ufw
sudo ufw deny 3163/udp
iptables
sudo iptables -A INPUT -p udp --dport 3163 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3163 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3163' -Direction Inbound -Protocol UDP -LocalPort 3163 -Action Block

Related ports

3161doc1lm3162sflm3164imprs3165newgenpay

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.