Port 3587Windows Peer-to-Peer Grouping

Legacy Windows peer-collaboration traffic for creating groups and exchanging messages between peer computers.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as p2pgroup

Technical Details

what runs on :3587

Port 3587 is assigned for Peer-to-Peer Grouping over both TCP and UDP. The service is associated with Windows peer-collaboration APIs: applications establish group membership and exchange group-related messages with other peers, rather than using a standard web or file-transfer protocol. Windows peer discovery may involve separate infrastructure such as PNRP; do not assume that seeing 3587 means a general P2P client is running.

Security Information

exposure of :3587

risk score

2/ 10safe

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

network services averages 2.7 across 1,419 ports — this one sits 0.7 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

tcp · udp

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

security overview

An exposed listener may accept peer-group connection attempts, so enable it only where legacy peer-collaboration software is required and restrict it to trusted networks or peers. This is an uncommon, legacy service; the port assignment alone does not establish that a host is vulnerable, and there is no basis here to claim a specific known exploit.

Record

iana registry entry

port: :3587
service: Windows Peer-to-Peer Grouping
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services System
usage: This assignment is associated with Windows Peer-to-Peer Grouping, a legacy peer-collaboration service used by applications to create groups and communicate among their members. It is not a general-purpose file-sharing or torrent port, and is uncommon on modern internet-facing hosts.
lookups: 0rank 993
added: 2026-09-30
updated: 2026-09-30
references: IANA service name registry — port 3587

Something wrong?

This record is maintained by the engineers who use port 3587. 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 2026-09-30.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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all 1,419 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3587Windows Peer-to-Peer Grouping

Technical Details

Security Information

Related Ports

Port 3587Windows Peer-to-Peer Grouping