IP lookup
IP address and reverse DNS lookup
Look up the reverse DNS name of an IP address, confirm it points back, and see which network owns it and whether it belongs to a CDN. Enter a domain instead to check each of its addresses.
We check from the outside, the way visitors see your site, and keep a simple log of sites checked. Privacy policy.
How it works
What this checks
- Reverse DNS (PTR) The hostname an IP address claims, which mail servers check before they accept mail.
- Forward confirmation Whether that hostname resolves back to the same IP address.
- Network owner The organization and network (ASN) the address belongs to.
- CDN detection Whether the address belongs to a CDN such as Cloudflare, in which case the real server is hidden behind it.
- Domains too Type a domain and every A and AAAA address it has is looked up in turn.