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Port 749 (kerberos-adm)

IANA assigns port 749 to kerberos-adm: kerberos administration.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
kerberos-adm TCP kerberos administration - -
kerberos-adm UDP kerberos administration - -

Check what is listening on port 749

Linux: is anything listening on TCP 749?
sudo ss -tlnp 'sport = :749'
Linux: UDP 749
sudo ss -ulnp 'sport = :749'
Linux / macOS: which process owns the port
sudo lsof -nP -i :749
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':749 '
Windows (Command Prompt)
netstat -ano | findstr :749
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 749 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 749
From Windows
Test-NetConnection HOST -Port 749
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 749

Block port 749 in the firewall

ufw
sudo ufw deny 749/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 749 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 749 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 749' -Direction Inbound -Protocol TCP -LocalPort 749 -Action Block
ufw
sudo ufw deny 749/udp
iptables
sudo iptables -A INPUT -p udp --dport 749 -j DROP
nftables
sudo nft add rule inet filter input udp dport 749 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 749' -Direction Inbound -Protocol UDP -LocalPort 749 -Action Block

Related ports

747fujitsu-dev748ris-cm750kerberos-iv754tell

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