Skip to main content

FreeToolsUseAI Tools Dashboard

Library

All Tools
184
AI Tools
5
Content Tools
8
SEO Tools
1
PDF Tools
5
Image Tools
3
Color Tools
24
Video Tools
3
Developer Tools
56
Marketing Tools
2
Productivity Tools
36
Scientific Tools
41

Settings

All Tools
Developer Tools
Reverse DNS Lookup

Categories

AI Tools
Content Tools
SEO Tools
PDF Tools
Image Tools
Color Tools
Video Tools
Developer Tools
Marketing Tools
Productivity Tools
Scientific Tools

Collections

Free YouTube Tools
Free DNS & Network Tools
Free SSL & Security Tools
Free PDF Tools
Free CSS Generators
Free Finance Calculators
Free JSON & Data Tools
Free Text & Writing Tools

Resources

All Tools
Guides
All Collections

Company

About
Contact
Privacy Policy
Terms of Use

© 2026 FreeToolsUse. All rights reserved.

Free online tools. No signup. Built for speed and privacy.

Reverse DNS Lookup

Look up PTR reverse DNS records for a public IP address. Resolve hostnames and verify forward DNS (FCrDNS) alignment.

IP address or hostname

Resolves PTR records for a public IP. Hostnames are resolved to their first public IP first. Forward DNS is checked to confirm PTR alignment.

Reverse lookups run from the server with SSRF protections. Only public addresses are allowed.

More Developer Tools

IP Address LookupLook up geolocation, ISP, ASN, reverse DNS, and IP format details for any public IPv4 or IPv6 address.
DNS LookupQuery public DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, CAA, and PTR.
Subnet CalculatorCalculate IPv4 subnet details from CIDR notation or a subnet mask. Get network, broadcast, and host ranges instantly.
CIDR CalculatorAnalyze CIDR blocks, convert prefix lengths to subnet masks, split networks, and check whether an IP belongs to a range.
DNS Propagation CheckerCheck DNS record propagation across global public resolvers. Compare answers from Google, Cloudflare, Quad9, and more.
DMARC CheckerLook up and parse DMARC DNS records for a domain. Review policy, reporting tags, and SPF alignment hints.