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Port 1026 (cap)

IANA assigns port 1026 to cap: Calendar Access Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cap TCP Calendar Access Protocol Doug Royer -
cap UDP Calendar Access Protocol Doug Royer -

Registry dates for this port: registered 2010-12-09.

Check what is listening on port 1026

Linux: is anything listening on TCP 1026?
sudo ss -tlnp 'sport = :1026'
Linux: UDP 1026
sudo ss -ulnp 'sport = :1026'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1026
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1026 '
Windows (Command Prompt)
netstat -ano | findstr :1026
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1026 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1026
From Windows
Test-NetConnection HOST -Port 1026
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1026

Block port 1026 in the firewall

ufw
sudo ufw deny 1026/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1026 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1026 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1026' -Direction Inbound -Protocol TCP -LocalPort 1026 -Action Block
ufw
sudo ufw deny 1026/udp
iptables
sudo iptables -A INPUT -p udp --dport 1026 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1026 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1026' -Direction Inbound -Protocol UDP -LocalPort 1026 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.