01Internet
Public IP
The address visible to an external service from this computer.
Network diagnostic workspace
Understand your connection.
The same local point of view as Vox on Android. Checks run on this computer; results stay organized here in your browser.
MEASURING FROM
Connecting…
Looking for a network interface
CHECKING LOCAL HELPER
LOCAL HELPER REQUIRED
Run tools from this computer
Vox needs a small helper on this computer for ping, LAN discovery, and the other local checks. It listens on this computer only, and nothing starts until you choose to install it.
PAIRING REQUIRED
Enter the pairing code
This helper is shared over the network, so it only answers a device you pair with it. Type the six-digit code shown on that computer, under phone access.
PHONE ACCESS
Use these tools from your phone
A phone cannot run these checks on itself, and it cannot reach this helper across the network until you allow it here. This page keeps working either way; a device on the network has to type a code that is new every time you turn access on.
NATIPv4 topology
NAT type
Compare this computer’s address, route, public IPv4, and STUN mappings.
02System resolver
DNS lookup
Resolve a name through this computer’s DNS configuration.
DNSResolver benchmark
DNS comparison
Compare local DNS, Cloudflare, Google, Quad9, and OpenDNS with repeated queries from this computer.
04Web · local
HTTP & TLS
Check status, response headers, timing, and HTTPS certificate.
06Download · upload · latency
Speed test
Measure download, upload, and idle latency from this computer over two timed transfers. Data use depends on connection speed.
Update the helper on this computer for a live speedometer. Completed results and history still work.
08Private networks
LAN discovery
Find responding devices and common open services. Scans the chosen interface's own network, or another private network this computer can route to.
09Registry · geolocation
IP lookup
Find the owner, network, and rough location of an address. Leave blank for your own.
10PTR · system resolver
Reverse DNS
Find the hostname an IP address resolves back to, if it has one.
11Encrypted DNS
DNS over HTTPS
Ask Cloudflare, Google, and Quad9 the same name and compare what each returns.
12Port 43 · local
Whois
Read the registration record for a domain or address range.
13Reachability
IPv6 check
Test whether IPv6 reaches the internet, not just whether an address exists.
03ICMP · local
Ping
Track latency and packet loss with individual probe results.
05Route · local
Traceroute
Follow the path to a host, hop by hop, from this computer.
07TCP · local
Port scan
Check selected TCP services from this computer.
14TCP · local
TCP ping
Measure latency by opening connections, for hosts that never answer ICMP.
15Latency stability
Jitter
Measure how much latency varies between probes — what calls and games actually feel.
16Protocol negotiation
HTTP versions
See which HTTP versions an endpoint will negotiate with this computer.
17Registry · structured
RDAP
The structured registry record: status, dates, contacts, and nameservers.
18Offline · no traffic
Subnet calculator
Calculate IPv4 or IPv6 ranges, split a network, or allocate VLSM host groups.
A bare IPv4 address uses /24; bare IPv6 uses /64. An IPv4 dotted mask also works. VLSM takes priority over equal split.
This computer’s helper needs an update for IPv6, split, and VLSM results. Use the installer links below, then restart the helper.
The helper listens only on 127.0.0.1. IP and speed checks contact the external services named in their results. Run tools only on networks you are allowed to test.