IP Lookup
Look up location, network, ASN, and reverse DNS details for any public IPv4 or IPv6 address.
What This Tool Does
Our IP lookup tool checks a public IP address and returns approximate location, ISP, ASN, PTR hostnames, forward-confirmed reverse DNS, and related network context. It works with both IPv4 and IPv6 addresses and is useful for quick diagnostics, verification, and investigation.
Common Use Cases
- Verify the location of a suspicious IP accessing your server
- Check which ISP and network block owns an IP range
- Investigate the origin of spam or malicious traffic
- Confirm your own public IP address and location data
- Debug geolocation issues in web applications
- Verify email server PTR and forward-confirmed reverse DNS configuration
- Identify the hostname behind an IP address from your logs
- Investigate a suspicious IP address from your security logs
Frequently Asked Questions
How accurate is IP geolocation?
IP geolocation is typically accurate at the country and city level (80-95% accuracy), but cannot pinpoint exact street addresses. Mobile IPs and VPNs may show incorrect locations. ISP and ASN data is highly accurate as it comes from official registry records.
Can I look up any IP address?
Yes, you can look up any valid public IPv4 or IPv6 address. Private IP addresses (like 192.168.x.x or 10.x.x.x) cannot be geolocated as they are not routable on the internet.
What is an ASN (Autonomous System Number)?
An ASN is a unique identifier assigned to networks (like ISPs or large organizations) that participate in internet routing. It helps identify who manages a particular IP address block.
Why is reverse DNS important for email?
Many email servers check that the sending IP has forward-confirmed reverse DNS: the PTR hostname resolves back to the same IP. Missing or mismatched PTR records often cause emails to be marked as spam or rejected entirely.
Why doesn't my IP have a reverse DNS record?
PTR records must be set up by whoever controls the IP address—usually your ISP or hosting provider. Many residential ISPs don't configure reverse DNS by default. Contact your provider to request PTR record setup.
Can I set my own reverse DNS?
Only the owner of the IP address block can set PTR records. For most users, this means contacting your ISP or hosting provider. Cloud providers like AWS, Azure, and GCP allow you to configure reverse DNS through their control panels.