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Port 3310 (dyna-access)

IANA assigns port 3310 to dyna-access: Dyna Access.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dyna-access TCP Dyna Access Dave Belliveau -
dyna-access UDP Dyna Access Dave Belliveau -

Check what is listening on port 3310

Linux: is anything listening on TCP 3310?
sudo ss -tlnp 'sport = :3310'
Linux: UDP 3310
sudo ss -ulnp 'sport = :3310'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3310
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3310 '
Windows (Command Prompt)
netstat -ano | findstr :3310
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3310 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3310
From Windows
Test-NetConnection HOST -Port 3310
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3310

Block port 3310 in the firewall

ufw
sudo ufw deny 3310/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3310 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3310 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3310' -Direction Inbound -Protocol TCP -LocalPort 3310 -Action Block
ufw
sudo ufw deny 3310/udp
iptables
sudo iptables -A INPUT -p udp --dport 3310 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3310 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3310' -Direction Inbound -Protocol UDP -LocalPort 3310 -Action Block

Related ports

3308tns-server3309tns-adv3311mcns-tel-ret3312appman-server

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