Hostname Lookup Tool — Domain to IP Address
Hostname lookup tool — find IP addresses behind any domain or hostname.
What Is Hostname Lookup?
Hostname lookup (domain to ip or resolve hostname) queries DNS for the IPv4 and IPv6 addresses behind a domain name.
VSPIC returns A and AAAA answers grouped by record type — a fast dns hostname lookup before deeper DNS Lookup checks.
How to Use This Tool
- Type the hostname or domain (e.g. example.com or www.example.com).
- Click Resolve Hostname to query public DNS.
- Review A records (IPv4) listed first when present.
- Review AAAA records (IPv6) when your DNS publishes them.
- Use DNS Lookup for MX, TXT, CNAME, and other record types.
DNS A Records Explained
A records map a hostname to one or more IPv4 addresses. Browsers use A records when connecting over IPv4.
a record lookup on www or apex names is the first step in hosting migrations.
DNS AAAA Records Explained
AAAA records map to IPv6 addresses. Dual-stack sites publish both A and AAAA for modern clients.
aaaa record lookup results appear separately when your resolver returns IPv6.
Forward DNS Resolution
Forward DNS starts with a name and ends with IPs — opposite of reverse DNS (IP to PTR hostname).
CDN and cloud providers may return different IPs by region even for one hostname.
Hostname vs Domain Name
| Term | Meaning |
|---|---|
| Domain | Registered zone (example.com) |
| Hostname | Specific host (api.example.com) |
| FQDN | Fully qualified hostname with trailing dot in DNS |
IPv4 vs IPv6 Records
| Record | Address family |
|---|---|
| A | IPv4 dotted decimal |
| AAAA | IPv6 hexadecimal groups |
Common DNS Resolution Issues
- NXDOMAIN — name does not exist or typo.
- Stale cache — old IP until TTL expires.
- Split DNS — internal vs public answers differ.
- Only IPv4 or only IPv6 published — half of dual-stack missing.
Use Cases
- Verify hosting after migration.
- Confirm CDN points to expected anycast ranges.
- Debug API subdomain resolution.
- Check IPv6 readiness alongside ipv6 test.
References
Disclaimer
Results reflect public DNS at query time. Authoritative answers may differ inside corporate networks. Use for lawful administration only.
Frequently Asked Questions
Hostname to IP address lookup resolves a domain name to IPv4 (A) and IPv6 (AAAA) addresses using forward DNS — the opposite direction of reverse DNS, which starts from an IP.
IP to domain lookup usually means reverse DNS (PTR) from IP to hostname. For domain to IP, use this hostname lookup tool; for IP to hostname, use Reverse DNS Lookup on the same site.
Hostname lookup queries DNS for the IP addresses behind a name — A and AAAA records grouped in results. Use it before deeper DNS Lookup for MX, TXT, or CNAME checks.
In DNS, a hostname is a name under a domain (www.example.com, mail.example.com). The registered domain is the zone; hostnames are labels within it that resolve via A, AAAA, or CNAME records.
On Windows, nslookup example.com or ping example.com shows IPs. On Linux/macOS, dig example.com A + AAAA or host example.com. This hostname lookup tool runs the same forward queries in your browser.
Open Command Prompt and run nslookup www.example.com — the Address lines are IPv4 answers. For IPv6, nslookup -type=AAAA example.com. Our online hostname lookup tool shows both families in one table.
A domain is the registered name (example.com). A hostname is a specific name under it (www.example.com or mail.example.com).
Load balancing, CDN anycast, and IPv4/IPv6 dual-stack publishing return several A and AAAA answers.
TTL caching, propagation delay, or typos in the hostname can delay updated records.
This resolver focuses on A and AAAA addresses for the name you enter. Use DNS Lookup for full record types including CNAME.
Next step for hostname lookup tool
Continue with dns lookup tool — dns checker on VSPIC.
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