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Port 7787 (popup-reminders)

IANA assigns port 7787 to popup-reminders: Popup Reminders Receive.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
popup-reminders TCP Popup Reminders Receive Robert Harvey -
popup-reminders UDP Popup Reminders Receive Robert Harvey -

Registry dates for this port: registered 2006-01.

Check what is listening on port 7787

Linux: is anything listening on TCP 7787?
sudo ss -tlnp 'sport = :7787'
Linux: UDP 7787
sudo ss -ulnp 'sport = :7787'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7787
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7787 '
Windows (Command Prompt)
netstat -ano | findstr :7787
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7787 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7787
From Windows
Test-NetConnection HOST -Port 7787
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7787

Block port 7787 in the firewall

ufw
sudo ufw deny 7787/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7787 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7787 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7787' -Direction Inbound -Protocol TCP -LocalPort 7787 -Action Block
ufw
sudo ufw deny 7787/udp
iptables
sudo iptables -A INPUT -p udp --dport 7787 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7787 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7787' -Direction Inbound -Protocol UDP -LocalPort 7787 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.