Port 4559HylaFAX

HylaFAX fax-server control and job-submission service, normally provided by hfaxd on TCP port 4559.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as hfaxd, fax server

Technical Details

what runs on :4559

HylaFAX uses a client/server protocol served by hfaxd, normally over TCP port 4559. The connection begins with a server greeting and proceeds through an FTP-like, line-oriented command exchange for authentication, job control, status, and file transfer; the fax itself is sent through the server's telephony device rather than directly over this port. HylaFAX deployments generally use TCP 4559 as the network service endpoint, with no encryption by default.

Security Information

exposure of :4559

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.9 across 1,081 ports — this one sits 3.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Internet exposure is generally inappropriate: the service may allow authenticated users to submit faxes, inspect job state, or retrieve received documents, and legacy configurations may expose cleartext authentication or weak access controls. Restrict it to trusted networks or a VPN, enforce strong local authentication and permissions, and treat received fax data and credentials as sensitive.

Record

iana registry entry

port: :4559
service: HylaFAX
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Network Services System
usage: HylaFAX clients connect to hfaxd on port 4559 to authenticate, submit and manage fax jobs, retrieve status, and access received faxes. It is typically found on Linux or Unix fax servers connected to modems or telephony gateways; although registered for TCP and UDP, normal deployments use TCP.
lookups: 0rank 994
added: 2026-09-10
updated: 2026-09-10
references: IANA service name registry — port 4559

Something wrong?

This record is maintained by the engineers who use port 4559. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-10.

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all 1,081 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4559HylaFAX

Technical Details

Security Information

Related Ports

Port 4559HylaFAX