HTTPfy

Port 95 (supdup)

IANA assigns port 95 to supdup: SUPDUP.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
supdup TCP SUPDUP Mark Crispin -
supdup UDP SUPDUP Mark Crispin -

Check what is listening on port 95

Linux: is anything listening on TCP 95?
sudo ss -tlnp 'sport = :95'
Linux: UDP 95
sudo ss -ulnp 'sport = :95'
Linux / macOS: which process owns the port
sudo lsof -nP -i :95
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':95 '
Windows (Command Prompt)
netstat -ano | findstr :95
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 95 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 95
From Windows
Test-NetConnection HOST -Port 95
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 95

Block port 95 in the firewall

ufw
sudo ufw deny 95/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 95 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 95 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 95' -Direction Inbound -Protocol TCP -LocalPort 95 -Action Block
ufw
sudo ufw deny 95/udp
iptables
sudo iptables -A INPUT -p udp --dport 95 -j DROP
nftables
sudo nft add rule inet filter input udp dport 95 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 95' -Direction Inbound -Protocol UDP -LocalPort 95 -Action Block

Related ports

93dcp94objcall96dixie97swift-rvf

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