Port 7707EM7 Dynamic Updates

TCP and UDP port 7707 is assigned to EM7 Dynamic Updates.

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

also known as sync-em7

Technical Details

what runs on :7707

EM7 Dynamic Updates is registered on port :7707 over tcp and udp to Christopher Cordray, assigned November 2004. 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 :7707

this machine

# linux
sudo ss -tulpn 'sport = :7707'

# macos / bsd
sudo lsof -nP -i :7707

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :7707

another host

nmap -sV -p T:7707 <host>
sudo nmap -sU -sV -p U:7707 <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 :7707

risk score

1/ 10safe

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

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

no security notes recorded for :7707 yet

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

Record

iana registry entry

port: :7707
service: EM7 Dynamic Updates
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns this port to EM7 Dynamic Updates and lists Christopher Cordray as the registrant. The assignment alone does not establish what software listens here or how it is used in deployments.
lookups: 0rank 993
added: 2026-10-13
updated: 2026-10-13
references: IANA service name registry — port 7707

Something wrong?

This record is maintained by the engineers who use port 7707. 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 2026-10-13.

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

browse categories →

ports registered around :7707, by lookups.

port	service	proto	category	risk	views
:7676	AlphaVision RCI	TCP	Remote Access	caution	14.5k
:7670	BrettspielWelt	TCP	Gaming	caution	12.8k
:7677	Sun App Server HTTPS	TCPUDPtls	Web Services	safe	0
:7725	Nitrogen Service	TCPUDP	—	safe	0
:7697	KLIO	TCPUDP	—	safe	0
:7720	MedImage Portal	TCPUDP	—	safe	0
:7741	ScriptView Network	TCPUDP	—	safe	0
:7680	Windows Delivery Optimization	TCPUDP	Network Services	caution	0

risk mix of the 8 listed

safe63%
caution38%

1 of 8 encrypted

Port :7707EM7 Dynamic Updates

Technical Details

Security Information

Related Ports

Port 7707EM7 Dynamic Updates