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Port 6998 (iatp-highpri)

IANA assigns port 6998 to iatp-highpri: IATP-highPri.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iatp-highpri TCP IATP-highPri John Murphy -
iatp-highpri UDP IATP-highPri John Murphy -

Check what is listening on port 6998

Linux: is anything listening on TCP 6998?
sudo ss -tlnp 'sport = :6998'
Linux: UDP 6998
sudo ss -ulnp 'sport = :6998'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6998
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6998 '
Windows (Command Prompt)
netstat -ano | findstr :6998
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6998 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6998
From Windows
Test-NetConnection HOST -Port 6998
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6998

Block port 6998 in the firewall

ufw
sudo ufw deny 6998/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6998 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6998 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6998' -Direction Inbound -Protocol TCP -LocalPort 6998 -Action Block
ufw
sudo ufw deny 6998/udp
iptables
sudo iptables -A INPUT -p udp --dport 6998 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6998 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6998' -Direction Inbound -Protocol UDP -LocalPort 6998 -Action Block

Related ports

6980qolyester6997MobilitySrv6999iatp-normalpri7000Cassandra inter-node / AirPlay

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