How do I check if a UDP port is open online?

Enter a host and UDP port (e.g. 8.8.8.8:53) in the UDP checker. The tool sends protocol-appropriate payloads from 50+ global nodes — for example, a real DNS query to port 53 or an NTP request to port 123 — and reports whether a valid response was received from each location.

Why does UDP port testing require a payload?

Unlike TCP, UDP has no handshake. An empty packet sent to most UDP services produces no response because the application is waiting for meaningful data before replying. The tool automatically injects the correct payload for known ports (DNS/53, NTP/123, SNMP/161, game servers/27015) to get a real, meaningful response.

How do I test if my VPN UDP port is reachable?

Enter your VPN server IP and port (typically UDP 1194 for OpenVPN or UDP 51820 for WireGuard) and run the UDP check. Results from multiple global nodes will show whether your VPN port is accessible worldwide or blocked by specific ISPs or regional networks.

Can I test game server ports with this UDP checker?

Yes. For Source Engine game servers (CS:GO, TF2, Rust) on port 27015, the tool automatically sends a valid Source Engine query packet. For other game servers, you can enter a custom hex payload in the advanced options. Results show which global regions can reach your game server.

8.8.8.8:53 için UDP Port Kontrolü

Gelişmiş Ayarlar

Dünya haritasını göster

Gelişmiş Seçenekler (Özel Payload)

Boş = bilinen portlar için otomatik probe (DNS, NTP, SNMP vb.).

Info Ping HTTP TCP UDP MTR DNS

UDP Kontrol 8.8.8.8:53

Gönderilen Payload:

0x241a010000010000000000000377777706676f6f676c6503636f6d0000010001

(Otomatik tespit edildi)

Kalıcı link |

Konum	Sonuç	Süre	IP Adresi
Albania, Tirana
Australia, Sydney
Bosnia and Herzegovina, Novi Travnik
Bulgaria, Sofia
Canada, Montreal
Switzerland, Bern
Chile, Santiago
China, Hohhot
Germany, Nuernberg
Germany, Frankfurt am Main
Germany, Frankfurt am Main
Germany, Limburg
Germany, Frankfurt am Main
Germany, Duesseldorf
Denmark, Glostrup Municipality
Spain, Bilbao
Finland, Helsinki
Finland, Helsinki
France, Gravelines
France, Paris
United Kingdom, London
Georgia, Tbilisi
Greece, Athens
Hong Kong, Hong Kong
Croatia, Zagreb
Hungary, Budapest
Indonesia, Jakarta
Israel, Petach Tikwa
Israel, Netanja
India, New Delhi
Iceland, Reykjavik (Miðborg)
Italy, Como
Kuwait, Kuwait City
Lithuania, Pilaite
Latvia, Riga
Moldova, Chisinau
Netherlands, Amsterdam
Netherlands, Amsterdam
Netherlands, Amsterdam
Netherlands, Amsterdam
Norway, Oslo
Poland, Warsaw
Romania, Bacău
Romania, Bucharest
Serbia, Belgrade
Russia, St Petersburg
Singapore, Singapore
Turkey, Istanbul
Taiwan, Taipei
United States, Miami
United States, Dallas
United States, Kansas City
United States, Dallas
South Africa, Johannesburg

Global UDP Port Denetleyici & Payload Enjektörü

50+ node üzerinden bağlantısız UDP protokollerinin erişilebilirliğini test eder.

Durumsuz Yönlendirme & Payload Enjeksiyonu

UDP'nin onay mekanizması yoktur. Motor, yanıt almak için uygulamaya özgü payload'lar enjekte eder (port 53 için DNS sorgusu, port 123 için NTP isteği).

Firewall & DDoS Azaltma Testi

UDP, hacimsel DDoS saldırılarının ana vektörüdür. Firewall'lar genellikle UDP'yi kısıtlar. Dağıtık test, meşru trafiğin filtreyi doğru geçtiğini doğrular.

Oyun, VoIP ve Yayın Analizi

Oyun sunucuları, VoIP (SIP/RTP) ve canlı yayın UDP'ye dayanır. Canlı UDP testi 60 saniye boyunca gecikme ve paket kaybını izler.