HTTPfy

Port 98 (tacnews)

IANA assigns port 98 to tacnews: TAC News.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
tacnews TCP TAC News Jon Postel -
tacnews UDP TAC News Jon Postel -

Check what is listening on port 98

Linux: is anything listening on TCP 98?
sudo ss -tlnp 'sport = :98'
Linux: UDP 98
sudo ss -ulnp 'sport = :98'
Linux / macOS: which process owns the port
sudo lsof -nP -i :98
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':98 '
Windows (Command Prompt)
netstat -ano | findstr :98
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 98 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 98
From Windows
Test-NetConnection HOST -Port 98
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 98

Block port 98 in the firewall

ufw
sudo ufw deny 98/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 98 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 98 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 98' -Direction Inbound -Protocol TCP -LocalPort 98 -Action Block
ufw
sudo ufw deny 98/udp
iptables
sudo iptables -A INPUT -p udp --dport 98 -j DROP
nftables
sudo nft add rule inet filter input udp dport 98 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 98' -Direction Inbound -Protocol UDP -LocalPort 98 -Action Block

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96dixie97swift-rvf99metagram101hostname

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