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Port 3427 (websphere-snmp)

IANA assigns port 3427 to websphere-snmp: WebSphere SNMP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
websphere-snmp TCP WebSphere SNMP Richard Mills -
websphere-snmp UDP WebSphere SNMP Richard Mills -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3427

Linux: is anything listening on TCP 3427?
sudo ss -tlnp 'sport = :3427'
Linux: UDP 3427
sudo ss -ulnp 'sport = :3427'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3427
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3427 '
Windows (Command Prompt)
netstat -ano | findstr :3427
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3427 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3427
From Windows
Test-NetConnection HOST -Port 3427
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3427

Block port 3427 in the firewall

ufw
sudo ufw deny 3427/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3427 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3427 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3427' -Direction Inbound -Protocol TCP -LocalPort 3427 -Action Block
ufw
sudo ufw deny 3427/udp
iptables
sudo iptables -A INPUT -p udp --dport 3427 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3427 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3427' -Direction Inbound -Protocol UDP -LocalPort 3427 -Action Block

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