Port 4059DLMS/COSEM
DLMS/COSEM smart-metering protocol for reading and managing electricity, gas, water, and other utility meters.
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- official
- risk
- 6/10
- lookups
- 0
2 transports registered
payload readable on path
registered with iana
risk
rank 993 of 5,018 · top 20%
Technical Details
what runs on :4059DLMS/COSEM is a standardized application protocol for utility metering. On TCP or UDP port 4059, deployments commonly use the DLMS wrapper, which carries application messages in an 8-byte header (version, source and destination identifiers, and payload length) followed by a DLMS application protocol data unit. A TCP session typically establishes an application association before clients issue operations such as GET, SET, or ACTION; exact addressing and access rules depend on the meter and profile. DLMS/COSEM can also run over other lower layers, including HDLC, but those deployments do not use this IP port.
Security Information
exposure of :4059risk score
6/ 10risk
treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.
network services averages 2.7 across 1,485 ports — this one sits 3.3 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
An exposed endpoint may reveal meter readings and, depending on the device's COSEM objects and access controls, allow configuration or control operations. Authentication and application-layer ciphering are supported but are not guaranteed to be enabled; deployments may use weak credentials or permit unprotected exchanges. Keep the service on a restricted metering network or behind a VPN, and allow access only from authorized clients.
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risk mix of the 8 listed
- caution100%
0 of 8 encrypted