Network
Verify a UDP port on your public IP — WireGuard, OpenVPN, game servers — or test remote DNS/NTP hosts. Real datagram probes from SkyPath’s Probe, not faked in the browser.
Real UDP from SkyPath’s Probe — not your browser
Open — the service replied to SkyPath’s UDP probe (for example a DNS answer or NTP response).
No reply (open or filtered) — silence is common for UDP: the port may be open but ignoring this probe, or a firewall dropped packets.
Filtered — the Probe could not send to the host (network/path failure before a service reply).
Known ports use service-specific payloads (DNS query, NTP request, and more). Other ports use a generic probe.
This test runs from SkyPath’s Probe — not your browser. Results show reachability from our network.
UDP has no handshake. An open service may stay silent if the probe is not a valid application request.
Closed ports sometimes send ICMP port unreachable, but many firewalls drop those messages — so silence often means open or filtered.
For TCP listeners and multi-port scans, use the Port Checker instead.
Your public IP is filled in on load — confirm it anytime with What Is My IP.
Pick WireGuard (51820), OpenVPN (1194), Minecraft Bedrock (19132), or enter a custom UDP port, then Check. An open reply means SkyPath’s Probe reached that forward from outside your LAN.
No reply is common for VPN datagrams: the port may still be open but quiet for our probe. Confirm with the real client if you expect traffic.
For well-known ports we send protocol-native packets — a DNS A query on 53, an NTP client request on 123, SNMP GetRequest on 161, and similar for SIP/IKE where practical.
Other ports get a short generic UDP probe. We never invent open/closed results in the browser.
No application reply arrived before the timeout. The port may be open and silent, or filtered by a firewall.
To confirm a service, try a known-good demo (8.8.8.8 DNS) or test with the real client application. If the host might be down entirely, try Ping Test.
DNS (53), NTP (123), SNMP (161), IKE/IPsec (500), OpenVPN (1194), SIP (5060), WireGuard (51820), and Minecraft Bedrock (19132) are frequent checks.
Need TCP instead? Open the Port Checker for single ports and scan profiles.
SkyPath’s Probe received a reply to its UDP probe. For DNS, that is usually a DNS response; for NTP, a time response. The service is reachable from SkyPath’s network on that port.
No response arrived before the timeout. UDP services often stay silent for unknown probes, and firewalls may drop packets. Try a service-specific port (like DNS 53) or confirm with the real application.
Yes. Datagrams are sent from SkyPath’s Probe network. The browser cannot open arbitrary UDP sockets, so online tools that claim “browser UDP” are not the same thing.
Not on this page — UDP checks are single-port for clarity and abuse control. For multi-port TCP scans, use the Port Checker.
Yes. Paste values like 8.8.8.8:53 into the host field; the port is filled automatically. Your public IP is also filled in on load so you can tap a common UDP port and Check immediately.
Checking ports you own or have permission to test is generally fine. Scanning systems you do not control may violate terms of service or local law. Use this tool responsibly.
SkyPath VPN
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