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Port 7998 (usicontentpush)

IANA assigns port 7998 to usicontentpush: USI Content Push Service.

Registered (user) port, 1024-49151 UDP

Port 7998 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
usicontentpush UDP USI Content Push Service Prakash Iyer -

Registry dates for this port: registered 2009-08-10.

Check what is listening on port 7998

Linux: UDP 7998
sudo ss -ulnp 'sport = :7998'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7998
Windows (Command Prompt)
netstat -ano | findstr :7998
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 7998

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7998

Block port 7998 in the firewall

ufw
sudo ufw deny 7998/udp
iptables
sudo iptables -A INPUT -p udp --dport 7998 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7998 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7998' -Direction Inbound -Protocol UDP -LocalPort 7998 -Action Block

Related ports

7982sossd-agent, sossd-disc7997pushns7999irdmi28000HTTP alternate / Django dev

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