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Port 9998 (distinct32)

IANA assigns port 9998 to distinct32: Distinct32.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
distinct32 TCP Distinct32 Anoop Tewari -
distinct32 UDP Distinct32 Anoop Tewari -

Check what is listening on port 9998

Linux: is anything listening on TCP 9998?
sudo ss -tlnp 'sport = :9998'
Linux: UDP 9998
sudo ss -ulnp 'sport = :9998'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9998
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9998 '
Windows (Command Prompt)
netstat -ano | findstr :9998
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9998 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9998
From Windows
Test-NetConnection HOST -Port 9998
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9998

Block port 9998 in the firewall

ufw
sudo ufw deny 9998/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9998 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9998 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9998' -Direction Inbound -Protocol TCP -LocalPort 9998 -Action Block
ufw
sudo ufw deny 9998/udp
iptables
sudo iptables -A INPUT -p udp --dport 9998 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9998 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9998' -Direction Inbound -Protocol UDP -LocalPort 9998 -Action Block

Related ports

9996palace-59997Splunk forwarder receiving9999distinct10000Webmin

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