Port 4742SICCT Service Discovery Protocol

UDP service discovery for finding networked SICCT chipcard terminals, primarily in German smartcard deployments.

transport: udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as sicct-sdp

1 other service is registered on port 4742. compare all 2 →

Technical Details

what runs on :4742

The IANA assignment is UDP for SICCT Service Discovery Protocol. As a discovery endpoint it uses connectionless datagrams rather than a TCP session; it helps locate SICCT terminals and is distinct from the subsequent communication with a terminal. The assignment alone does not establish a specific broadcast or multicast method, packet format, or default terminal port, so those details should be checked against the applicable SICCT specification and deployment.

Security Information

exposure of :4742

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,573 ports — this one sits 1.6 below.

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

udp

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

security overview

Discovery traffic is not encrypted by default. Keep it on the trusted local network and do not expose it to the public internet: discovery can reveal terminal presence, while the security of any later terminal interaction depends on the separate SICCT implementation and configuration.

Record

iana registry entry

port: :4742
service: SICCT Service Discovery Protocol
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: This is the discovery service associated with SICCT (Secure Interoperable Chipcard Terminal), a protocol family for networked chipcard terminals. Engineers are most likely to encounter it on local networks with smartcard infrastructure, including German healthcare deployments.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4742

Something wrong?

This record is maintained by the engineers who use port 4742. 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 2026-10-05.

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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4742SICCT Service Discovery Protocol

Technical Details

Security Information

Related Ports

Port 4742SICCT Service Discovery Protocol