HTTPfy

Port 4420 (nvme)

IANA assigns port 4420 to nvme: NVM Express over Fabrics storage access.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nvme TCP NVM Express over Fabrics storage access NVM Express Inc -
nvme UDP NVM Express over Fabrics storage access NVM Express Inc -

Registry dates for this port: registered 2016-03-31, last modified 2018-03-27.

Check what is listening on port 4420

Linux: is anything listening on TCP 4420?
sudo ss -tlnp 'sport = :4420'
Linux: UDP 4420
sudo ss -ulnp 'sport = :4420'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4420
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4420 '
Windows (Command Prompt)
netstat -ano | findstr :4420
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4420 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4420
From Windows
Test-NetConnection HOST -Port 4420
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4420

Block port 4420 in the firewall

ufw
sudo ufw deny 4420/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4420 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4420 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4420' -Direction Inbound -Protocol TCP -LocalPort 4420 -Action Block
ufw
sudo ufw deny 4420/udp
iptables
sudo iptables -A INPUT -p udp --dport 4420 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4420 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4420' -Direction Inbound -Protocol UDP -LocalPort 4420 -Action Block

Related ports

4418axysbridge4419cbp4421scaleft4422tsepisp

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