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Port 15Netstat Service

**Netstat Service** is commonly found on port 15 across various systems but it remains unofficial and rarely used today. It traditionally allows administrators and diagnostic tools to monitor active network connections, routing tables, interface statistics, masquerade connections, and multicast memberships on a system. Because it facilitates introspection of network activity, this port can reveal valuable insights about system connectivity..

inNetwork ServicesSystem
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
9,085

rank 540 of 993 · top 54%

Technical Details

what runs on :15

Technical Overview

Port 15 has historically been referenced as associated with the Netstat Service, although it is not officially assigned or widely implemented. Its intended functionality revolves around supporting network utilities that collect and present network status information by exposing certain diagnostics over the network. In practice, most modern implementations embed netstat-like capabilities within authenticated system consoles or management interfaces rather than a dedicated service or port.

The service—if implemented—enables retrieval of key information regarding:

  • Open and listening ports
  • Active TCP sessions
  • Network interface details
  • Routing table entries

Protocol Support

Port 15 can operate via both TCP and UDP as per legacy references, but it lacks a standardized protocol definition. The absence of formalization limits interoperability and support. There is no SCTP usage due to its age and purpose. Nowadays, administrators rely on local execution of commands rather than remote access through port 15.

Deployment Context

Today, port 15 is largely obsolete and typically closed by default. However, some specialized, legacy, or embedded systems might still expose this port for backward compatibility or diagnostics access in controlled environments. It is recommended to restrict such access tightly.

Security Information

exposure of :15

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.9 across 604 ports — this one sits 0.1 above.

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 Vulnerabilities

  • If enabled externally, it might leak sensitive network configuration and connection details.
  • Lack of encryption exposes information to eavesdroppers.
  • Weak or absent authentication could permit unauthorized monitoring or exploitation.
  • Attackers can use information gathered for lateral movement or targeted attacks.

Common Mitigations

  • Disable external access to port 15 entirely if not in explicit use.
  • Enforce strict authentication and access controls on any diagnostics service.
  • Use system-local tools instead of exposing diagnostics over the network.
  • Employ firewalls and segmentation to block unsolicited inbound connections.
  • Regularly audit and monitor network ports to detect unexpected exposure.

Related Ports

all 604 in network services →

the 8 most looked-up other ports in network services — 604 ports carry that label.

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:3268Microsoft Global Catalog (GC)caution
:135Microsoft EPMAPcaution
:3128Tatsoft Default HTTP Proxycaution

risk mix of the 8 listed

  • caution100%

0 of 8 encrypted