Port 5787Cisco WAAS Cluster Protocol

UDP port 5787 is assigned to Cisco WAAS Cluster Protocol for cluster communications between Cisco WAAS systems.

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

Technical Details

what runs on :5787

Cisco WAAS Cluster Protocol is registered on port :5787 over udp to Winston Chou, assigned February 2011. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :5787

this machine

# linux
sudo ss -ulpn 'sport = :5787'

# macos / bsd
sudo lsof -nP -i :5787

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5787

another host

sudo nmap -sU -sV -p U:5787 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :5787

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 1,674 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

no security notes recorded for :5787 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :5787
service: Cisco WAAS Cluster Protocol
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: The IANA assignment identifies this as the Cisco WAAS Cluster Protocol and lists Winston Chou as the registrant. Publicly established details about its wire behavior or where it is encountered are limited.
lookups: 0rank 993
added: 2026-10-09
updated: 2026-10-09
references: IANA service name registry — port 5787

Something wrong?

This record is maintained by the engineers who use port 5787. 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 2026-10-09.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 1,674 in network services →

the 8 most looked-up other ports in network services — 1,674 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5787Cisco WAAS Cluster Protocol

Technical Details

Security Information

Related Ports

Port 5787Cisco WAAS Cluster Protocol