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// Other services

Port 7787: Popup Reminders Receive

Port 7787 is assigned by IANA to popup-reminders (Popup Reminders Receive).

7787

How popup-reminders works

Other services
client:7787popup-remindersresponse client:7787popup-remindersresponse

The client sends a request to port 7787 and the popup-reminders service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 7787 dangerous?

We have no specific security note for port 7787. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7787

ServicePortTransportDescriptionReferenceUpdated
popup-reminders 7787 TCP, UDP Popup Reminders Receive
Reported: Known Unauthorized Use on port 7787
 - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 7787, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7787'      # process listening on 7787
sudo lsof -nP -i :7787

macOS

sudo lsof -nP -i :7787

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7787 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7787
netstat -ano | findstr :7787

From another machine

nmap -p 7787 -sV <host>
sudo nmap -sU -p 7787 <host>
nc -zv <host> 7787

Block it in the firewall

sudo ufw deny 7787/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7787" -Direction Inbound -LocalPort 7787 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7787 used for?

Port 7787 is assigned by IANA to popup-reminders (Popup Reminders Receive).

Is port 7787 TCP or UDP?

Port 7787 is registered for TCP and UDP.

Is it safe to open port 7787?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 7787 is open?

On Linux run "ss -ltnup 'sport = :7787'", on macOS "lsof -nP -i :7787", and on Windows "netstat -ano | findstr :7787" to see the local process. From another machine, "nmap -p 7787 <host>" shows whether it is reachable.

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