- Bind the service to localhost or a private network, never to a public address.
- Enable authentication, use per-application accounts and require TLS.
- Watch for exposed Docker ports: publish them on 127.0.0.1 only.
Port 118: SQL Services
Port 118 is assigned by IANA to sqlserv (SQL Services).
118
How sqlserv works
Databases & cachesThe application sends a SQL query to the sqlserv server on port 118, which returns rows from its tables.
- 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
- Databases & caches
Is port 118 dangerous?
We have no specific security note for port 118. Its risk depends on the program actually listening on it. General advice for databases & caches services:
IANA registry entries for port 118
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| sqlserv | 118 | TCP, UDP | SQL Services | - | - |
// source: IANA service name and port number registry
Which program uses port 118, and is it reachable?
Linux
sudo ss -ltnup 'sport = :118' # process listening on 118
sudo lsof -nP -i :118macOS
sudo lsof -nP -i :118
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 118 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 118 netstat -ano | findstr :118
From another machine
nmap -p 118 -sV <host> sudo nmap -sU -p 118 <host> nc -zv <host> 118
Block it in the firewall
sudo ufw deny 118/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 118" -Direction Inbound -LocalPort 118 -Protocol TCP -Action Block # Windows
What is port 118 used for?
Port 118 is assigned by IANA to sqlserv (SQL Services).
Is port 118 TCP or UDP?
Port 118 is registered for TCP and UDP.
Is it safe to open port 118?
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. Bind the service to localhost or a private network, never to a public address.
How do I check if port 118 is open?
On Linux run "ss -ltnup 'sport = :118'", on macOS "lsof -nP -i :118", and on Windows "netstat -ano | findstr :118" to see the local process. From another machine, "nmap -p 118 <host>" shows whether it is reachable.
Other databases & caches ports
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk