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Port 618 (dei-icda)

IANA assigns port 618 to dei-icda: DEI-ICDA.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dei-icda TCP DEI-ICDA David Turner -
dei-icda UDP DEI-ICDA David Turner -

Check what is listening on port 618

Linux: is anything listening on TCP 618?
sudo ss -tlnp 'sport = :618'
Linux: UDP 618
sudo ss -ulnp 'sport = :618'
Linux / macOS: which process owns the port
sudo lsof -nP -i :618
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':618 '
Windows (Command Prompt)
netstat -ano | findstr :618
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 618 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 618
From Windows
Test-NetConnection HOST -Port 618
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 618

Block port 618 in the firewall

ufw
sudo ufw deny 618/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 618 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 618 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 618' -Direction Inbound -Protocol TCP -LocalPort 618 -Action Block
ufw
sudo ufw deny 618/udp
iptables
sudo iptables -A INPUT -p udp --dport 618 -j DROP
nftables
sudo nft add rule inet filter input udp dport 618 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 618' -Direction Inbound -Protocol UDP -LocalPort 618 -Action Block

Related ports

616sco-sysmgr617sco-dtmgr619compaq-evm620sco-websrvrmgr

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