IPv6 Checker API
Detect IPv6 DNS records, reachability, and HTTPS support for any domain.
Last Updated: 01 April 2026
The Velohost IPv6 Checker API provides a programmatic way to determine whether a domain supports IPv6 networking.
It inspects DNS records, validates IPv6 reachability, and checks whether HTTPS is available over IPv6.
Base API URL
All endpoints listed below are relative to this base URL.
https://api.velohost.co.uk/ipv6-checker/ Rate Limiting
This API is protected by a global rate limit to ensure fair usage and platform stability.
- Limit: 30 requests per 10 seconds per IP address
- Burst traffic is allowed
- No authentication required
-
Requests exceeding the limit return
HTTP 429
This limit applies across all Velohost public APIs.
Error responses
The API uses standard HTTP status codes to indicate errors.
Returned when the global rate limit is exceeded.
{
"detail": "Rate limit exceeded"
}
Returned when the domain parameter is missing or invalid.
Endpoints
Check IPv6 support
Resolves IPv6 DNS records for a domain, verifies network reachability, and checks HTTPS availability over IPv6.
GET /lookup?domain=example.com
<lbrace>'<lbrace>'<rbrace>
"domain": "example.com",
"has_ipv6": true,
"ipv6_addresses": [
"2606:4700::6812:1b78",
"2606:4700::6812:1a78"
],
"reachable": true,
"https_over_ipv6": true,
"source": "dns_and_tcp"
<lbrace>'<rbrace>'<rbrace>
Implementation Guidance
For production use, validate input before sending requests, implement retry with exponential backoff on 429 or transient failures, and log normalized responses for trend monitoring.
Learn more
Explore the tool, documentation, and guides.