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// Other services

Port 7997: PUSH Notification Service

Port 7997 is assigned by IANA to pushns (PUSH Notification Service).

7997

How pushns works

Other services
client:7997pushnsresponse client:7997pushnsresponse

The client sends a request to port 7997 and the pushns service answers.

Transport
TCP
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 7997 dangerous?

We have no specific security note for port 7997. 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 7997

ServicePortTransportDescriptionReferenceUpdated
pushns 7997 TCP PUSH Notification Service - 2011-01-31
-7997-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 7997, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7997'      # process listening on 7997
sudo lsof -nP -i :7997

macOS

sudo lsof -nP -i :7997

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7997 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7997
netstat -ano | findstr :7997

From another machine

nmap -p 7997 -sV <host>
nc -zv <host> 7997

Block it in the firewall

sudo ufw deny 7997/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7997" -Direction Inbound -LocalPort 7997 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7997 used for?

Port 7997 is assigned by IANA to pushns (PUSH Notification Service).

Is port 7997 TCP or UDP?

Port 7997 is registered for TCP.

Is it safe to open port 7997?

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 7997 is open?

On Linux run "ss -ltnup 'sport = :7997'", on macOS "lsof -nP -i :7997", and on Windows "netstat -ano | findstr :7997" to see the local process. From another machine, "nmap -p 7997 <host>" shows whether it is reachable.

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