HTTPfy

Port 9201 (wap-wsp-wtp)

IANA assigns port 9201 to wap-wsp-wtp: WAP session service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wap-wsp-wtp TCP WAP session service WAP Forum -
wap-wsp-wtp UDP WAP session service WAP Forum -

Check what is listening on port 9201

Linux: is anything listening on TCP 9201?
sudo ss -tlnp 'sport = :9201'
Linux: UDP 9201
sudo ss -ulnp 'sport = :9201'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9201
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9201 '
Windows (Command Prompt)
netstat -ano | findstr :9201
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9201 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9201
From Windows
Test-NetConnection HOST -Port 9201
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9201

Block port 9201 in the firewall

ufw
sudo ufw deny 9201/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9201 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9201' -Direction Inbound -Protocol TCP -LocalPort 9201 -Action Block
ufw
sudo ufw deny 9201/udp
iptables
sudo iptables -A INPUT -p udp --dport 9201 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9201' -Direction Inbound -Protocol UDP -LocalPort 9201 -Action Block

Related ports

9191sun-as-jpda9200Elasticsearch / OpenSearch HTTP9202wap-wsp-s9203wap-wsp-wtp-s

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