IPv6 Site Checker Documentation

Overview

The IPv6 Site Checker is a tool designed to check IPv6 issues on websites. It does not support IPv4.

Infrastructure

• Primary Check: Located on AWS Germany. (ASN: 16509)
• Secondary Check: Located on SERVER-FACTORY in Netherlands. (ASN: 206075)

The tool currently runs on an IPv6-only servers. Please note that locations and ASNs may change in the future.

Uses HEAD requests with a custom User-Agent: "Request sent by IPv6 Checker at v6monitor.com"

Supports HTTP/1.1, HTTP/2 and HTTP/3

Check Types

The tool only performs HTTP and HTTPS checks. By default, it only performs HTTP checks. To perform an HTTPS check, add "https" to the URL being checked.

Example: to check the HTTPS version of example.com, enter `https://example.com` as the URL.

Check Scope

The tool only checks the root of the domain (e.g. example.com). Any URLs with paths (e.g. example.com/path/to/resource) are stripped for the check. Additionally, the tool only checks connectivity issues and considers any HTTP codes as valid.

DNS and Caching

We use Cloudflare's DNS service to retrieve the IPv6 address for the domain being checked. Only one IP address is checked at a time. Results are cached for 1 minute.

Failed Checks

Failed checks are automatically added to our database and displayed on the Failed Domains page. They will be removed once a successful test or no IPv6 result is returned.

Secondary check is only done if the primary check fails. If the secondary check is successful, it will return a warning, but won't add it to the failed list.

Primary check has a timeout of 1.5 seconds, while the secondary check has a timeout of 0.5 seconds.