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Port 3048 (pctrader)

IANA assigns port 3048 to pctrader: Sierra Net PC Trader.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pctrader TCP Sierra Net PC Trader Chris Hahn -
pctrader UDP Sierra Net PC Trader Chris Hahn -

Check what is listening on port 3048

Linux: is anything listening on TCP 3048?
sudo ss -tlnp 'sport = :3048'
Linux: UDP 3048
sudo ss -ulnp 'sport = :3048'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3048
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3048 '
Windows (Command Prompt)
netstat -ano | findstr :3048
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3048 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3048
From Windows
Test-NetConnection HOST -Port 3048
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3048

Block port 3048 in the firewall

ufw
sudo ufw deny 3048/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3048 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3048 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3048' -Direction Inbound -Protocol TCP -LocalPort 3048 -Action Block
ufw
sudo ufw deny 3048/udp
iptables
sudo iptables -A INPUT -p udp --dport 3048 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3048 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3048' -Direction Inbound -Protocol UDP -LocalPort 3048 -Action Block

Related ports

3046di-ase3047hlserver3049nsws3050gds-db, gds_db

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