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Port 2603 (servicemeter)

IANA assigns port 2603 to servicemeter: Service Meter.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
servicemeter TCP Service Meter Duncan Hare -
servicemeter UDP Service Meter Duncan Hare -

Check what is listening on port 2603

Linux: is anything listening on TCP 2603?
sudo ss -tlnp 'sport = :2603'
Linux: UDP 2603
sudo ss -ulnp 'sport = :2603'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2603
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2603 '
Windows (Command Prompt)
netstat -ano | findstr :2603
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2603 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2603
From Windows
Test-NetConnection HOST -Port 2603
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2603

Block port 2603 in the firewall

ufw
sudo ufw deny 2603/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2603 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2603 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2603' -Direction Inbound -Protocol TCP -LocalPort 2603 -Action Block
ufw
sudo ufw deny 2603/udp
iptables
sudo iptables -A INPUT -p udp --dport 2603 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2603 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2603' -Direction Inbound -Protocol UDP -LocalPort 2603 -Action Block

Related ports

2601discp-client2602discp-server2604nsc-ccs2605nsc-posa

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