Port 5556Freeciv
Freeciv is an open-source, turn-based multiplayer strategy game inspired by the Civilization series. It allows players to build empires, manage resources, and engage in diplomacy and warfare with other participants over network connections..
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 6,077
2 transports registered
payload readable on path
used by convention
caution
rank 820 of 993 · top 83%
Technical Details
what runs on :5556Freeciv is a free and open-source strategy game modeled after the popular Civilization franchise. It supports multiplayer gameplay via client-server architecture, enabling users to host game servers to which multiple clients connect using TCP and UDP port 5556 by default. The game communicates various commands, world states, and player interactions across the network using its proprietary text-based protocol.
Freeciv servers listen on port 5556 to coordinate game events, handle turn processing, and distribute game state updates. Both TCP and UDP protocols are utilized: TCP is primarily used for reliable delivery of stateful commands, while UDP can be used for broadcast messages or certain low-latency functionalities depending on configurations.
Port 5556 is not officially assigned by IANA but is widely recognized as the default port for Freeciv servers. Because the server can be hosted on various operating systems, firewall and NAT configurations should be considered to allow inbound and outbound traffic on this port to facilitate gameplay.
Security Information
exposure of :5556risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
gaming averages 4.0 across 124 ports — this one sits level with it.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
unofficial
used by convention, not registered — what answers here varies by deployment
reachable over
tcp · udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common security vulnerabilities for services running on port 5556 include:
- Unrestricted access: Open game servers can be discovered through port scanning, allowing unauthorized access or denial of service attacks.
- Insecure communication: Since encryption is typically unsupported by default, communications can be intercepted or manipulated by attackers.
- Exploitation of server bugs: Vulnerabilities in the Freeciv server software could allow remote code execution or buffer overflow exploits.
Typical mitigation strategies:
- Access controls: Limit server access to trusted hosts via firewall rules or IP whitelisting.
- Patch management: Keep the Freeciv server software updated with security patches and bug fixes.
- Encryption tunnels: Use VPN or SSH tunneling if secure connections are desired.
- Network segmentation: Run Freeciv servers in isolated network zones to reduce attack surface.
- Monitoring: Employ intrusion detection to identify suspicious activity targeting this port.
Related Ports
the 8 most looked-up other ports in gaming — 124 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :8888 | D2GS Admin Console | TCP | Remote Access | caution | 83.7k |
| :8888 | Earthland Realms 2 Server | TCP | Gaming | caution | 73.1k |
| :1513 | Garena Gaming | TCPUDP | Gaming | caution | 33.1k |
| :5555 | Freeciv | TCP | Security | caution | 26.9k |
| :18200 | Audition Online Server Check | TCPUDP | Gaming | caution | 20.9k |
| :12345 | NetBus / NetBuster | Security | caution | 19.9k | |
| :18206 | Audition FAM DB | TCPUDP | Databases | caution | 19.1k |
| :18505 | Audition Dance Battle Status Check | TCPUDP | Network Services | caution | 18.9k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted