- Answer only the networks that need the service (no open resolvers, relays or reflectors).
- UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
- Disable legacy test services that have no use in production.
Port 98: TAC News
Port 98 is assigned by IANA to tacnews (TAC News).
98
How tacnews works
Network servicesThe client sends a request to port 98 and the tacnews service answers.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Well-known (0-1023)
- Category
- Network services
Is port 98 dangerous?
We have no specific security note for port 98. Its risk depends on the program actually listening on it. General advice for network services services:
IANA registry entries for port 98
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| tacnews | 98 | TCP, UDP | TAC News | - | - |
// source: IANA service name and port number registry
Which program uses port 98, and is it reachable?
Linux
sudo ss -ltnup 'sport = :98' # process listening on 98
sudo lsof -nP -i :98macOS
sudo lsof -nP -i :98
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 98 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 98 netstat -ano | findstr :98
From another machine
nmap -p 98 -sV <host> sudo nmap -sU -p 98 <host> nc -zv <host> 98
Block it in the firewall
sudo ufw deny 98/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 98" -Direction Inbound -LocalPort 98 -Protocol TCP -Action Block # Windows
What is port 98 used for?
Port 98 is assigned by IANA to tacnews (TAC News).
Is port 98 TCP or UDP?
Port 98 is registered for TCP and UDP.
Is it safe to open port 98?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).
How do I check if port 98 is open?
On Linux run "ss -ltnup 'sport = :98'", on macOS "lsof -nP -i :98", and on Windows "netstat -ano | findstr :98" to see the local process. From another machine, "nmap -p 98 <host>" shows whether it is reachable.
Other network services ports
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk