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.

time.nist.gov:123 için Rapor

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp time.nist.gov:123

report.used_payload:

0x1b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Apr 21, 2026 04:59:30 UTC tarihinde kontrol edildi |

| Tekrar kontrol et |

Konum	Sonuç	Süre	IP Adresi
Albania, Tirana	OPEN	182.0 ms	132.163.96.6
Australia, Sydney	OPEN	167.0 ms	132.163.96.1
Bosnia and Herzegovina, Novi Travnik	OPEN	152.0 ms	132.163.96.4
Bulgaria, Sofia	OPEN	146.0 ms	132.163.97.1
Canada, Montreal	OPEN	42.0 ms	132.163.97.4
Switzerland, Bern	OPEN	131.0 ms	132.163.96.4
Chile, Santiago	OPEN	141.0 ms	132.163.97.3
China, Hohhot	OPEN	235.0 ms	132.163.96.6
Germany, Nuernberg	OPEN	141.0 ms	132.163.96.2
Germany, Frankfurt am Main	OPEN	129.0 ms	132.163.97.1
Germany, Frankfurt am Main	Timeout	-	132.163.97.2
Germany, Limburg	OPEN	135.0 ms	132.163.96.4
Germany, Frankfurt am Main	OPEN	123.0 ms	132.163.96.1
Germany, Duesseldorf	OPEN	121.0 ms	132.163.96.1
Denmark, Glostrup Municipality	OPEN	148.0 ms	132.163.96.4
Spain, Bilbao	OPEN	162.0 ms	132.163.96.4
Finland, Helsinki	OPEN	150.0 ms	132.163.96.2
Finland, Helsinki	OPEN	156.0 ms	132.163.96.3
France, Gravelines	OPEN	124.0 ms	132.163.97.4
France, Paris	OPEN	126.0 ms	132.163.96.1
United Kingdom, London	OPEN	124.0 ms	132.163.96.3
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	time.nist.gov
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	time.nist.gov
Hong Kong, Hong Kong	Timeout	-	132.163.97.1
Croatia, Zagreb	OPEN	148.0 ms	132.163.96.3
Hungary, Budapest	OPEN	159.0 ms	132.163.97.3
Indonesia, Jakarta	OPEN	206.0 ms	132.163.97.4
Israel, Petach Tikwa	OPEN	179.0 ms	132.163.96.3
Israel, Netanja	OPEN	177.0 ms	132.163.96.3
India, New Delhi	OPEN	260.0 ms	132.163.96.1
Iceland, Reykjavik (Miðborg)	OPEN	164.0 ms	132.163.96.4
Italy, Como	OPEN	139.0 ms	132.163.97.4
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	time.nist.gov
Lithuania, Pilaite	OPEN	177.0 ms	132.163.96.4
Latvia, Riga	OPEN	182.0 ms	132.163.97.3
Moldova, Chisinau	OPEN	198.0 ms	132.163.96.6
Netherlands, Amsterdam	OPEN	124.0 ms	132.163.97.2
Netherlands, Amsterdam	OPEN	120.0 ms	132.163.97.2
Netherlands, Amsterdam	OPEN	124.0 ms	132.163.97.6
Netherlands, Amsterdam	OPEN	90.0 ms	129.6.15.25
Norway, Oslo	OPEN	143.0 ms	132.163.97.2
Poland, Warsaw	OPEN	158.0 ms	132.163.97.6
Romania, Bacău	OPEN	161.0 ms	132.163.96.2
Romania, Bucharest	Timeout	-	132.163.96.6
Serbia, Belgrade	OPEN	181.0 ms	132.163.96.6
Russia, St Petersburg	OPEN	153.0 ms	132.163.97.4
Singapore, Singapore	OPEN	204.0 ms	132.163.97.4
Turkey, Istanbul	OPEN	139.0 ms	129.6.15.27
Taiwan, Taipei	Timeout	-	132.163.96.2
United States, Miami	Timeout	-	132.163.96.3
United States, Dallas	OPEN	48.0 ms	132.163.96.2
United States, Kansas City	OPEN	23.0 ms	132.163.97.3
United States, Dallas	OPEN	33.0 ms	132.163.97.6
South Africa, Johannesburg	OPEN	261.0 ms	132.163.96.2