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IP & Hosting Lookup
See who hosts any domain. Domain Doctor resolves the IP and reveals the hosting provider, network (ASN), location and reverse DNS.
VASTROX HOSTING · EMAIL · DNS · SSL
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What this checks
Every domain lives on a server with an IP address, owned by a hosting provider and announced by a network (ASN). Knowing who hosts a site helps with migrations, abuse reports, competitive research and troubleshooting.
Domain Doctor resolves your domain to its IP, looks up the hosting provider and ASN, geolocates the server, and checks the reverse DNS (PTR) record — including whether it forward-confirms, which matters for email trust.
Common IP & Hosting Lookup errors
- Reverse DNS (PTR) missing on a mail-sending IP
- PTR that does not forward-confirm (no FCrDNS)
- Domain still resolving to a former host after migration
VASTROX HOSTING & VPS
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Frequently asked questions
What is an ASN?
An Autonomous System Number identifies the network that announces an IP range on the internet — usually the hosting provider or ISP.
Why does reverse DNS matter?
Mail servers check the PTR record of your sending IP. A missing or non-matching PTR hurts deliverability and can cause outright rejection.