Why does my government PDF show a yellow question mark?

Indian government PDFs are digitally signed using certificates from NIC, eMudhra, or other CCA India licensed authorities. Adobe Acrobat and most PDF viewers don't include India's Root Certifying Authority (RCAI) in their default trusted certificate store. So even though the signature is completely valid and legally recognised under the Information Technology Act 2000, your PDF viewer shows a yellow question mark because it cannot automatically verify the issuer. Kagazo checks your PDF against the actual CCA India trust hierarchy and gives you a copy with a permanent green tick visible on any device.

Is my document safe? Do you store my PDF?

Your PDF is processed entirely in memory during verification. We never write your file to disk, never store it on our servers, and never share it with any third party. The file is deleted from memory immediately after verification is complete. You can also verify this by checking our open source backend code.

Which documents does Kagazo support?

Kagazo supports any PDF digitally signed under India's CCA certificate hierarchy. This includes e-Aadhaar, PAN card, DigiLocker documents, ITR-V, Form 16, and all state government certificates from Tamil Nadu e-District, AP and Telangana MeeSeva, Karnataka Nadakacheri and eJanma, Kerala Sevana portal, and more.

My Aadhaar PDF is password protected. Will it work?

Yes. Enter your Aadhaar password (first four letters of your name in capital letters followed by your birth year, for example RAMA1995) in the password field that appears after you upload your e-Aadhaar PDF. We decrypt it in memory, verify the signature, and return a verified copy.

What is the difference between "Signature Valid" and "Signature Unknown"?

Signature Valid means the document is genuinely issued by the government authority and has not been modified. Signature Unknown means your PDF viewer cannot verify the certificate chain — this is a viewer configuration issue, not a problem with your document. Signature Invalid means the document may have been tampered with or re-saved after signing.

Does this work on mobile?

Yes. Kagazo is fully mobile responsive and works on any Android or iOS browser. No app installation required. Simply open kagazo.in on your phone browser, upload your PDF and verify instantly.

PTR Record Resolution • Forward-Confirmed Reverse DNS (FCrDNS)

Reverse IP Lookup & Hostname Resolver

Resolve any IP address backward to its canonical hostname and PTR records. Verify mail server authenticity and inspect network ISP details.

Mail Server FCrDNS PTR Pointer Discovery Instant Real-Time Lookup

Quick samples:

Why Reverse DNS (rDNS) is Essential

While standard DNS maps a domain name to an IP, reverse DNS goes the opposite direction:

Spam Defense Verification

Most major mail servers will drop or spam-quarantine messages from SMTP servers that lack matching forward and reverse DNS records.

Network Troubleshooting

Traceroute and ping utilities rely on reverse DNS to display intelligible router and hop hostnames along network pathways.

Frequently Asked Questions

What is a Reverse IP Lookup and how does it work?

A Reverse IP lookup queries the DNS system for PTR (Pointer) records in reverse order (e.g. 8.8.8.8 queries 8.8.8.8.in-addr.arpa) to discover the registered hostname assigned to that IP address.

Why is reverse DNS critical for email deliverability?

Spam filters (like Gmail and Outlook) verify that the sending mail server’s IP address has a valid PTR record matching its Forward DNS (FCrDNS). Missing or mismatched reverse DNS often causes legitimate emails to be rejected or marked as spam.

Can all IP addresses be resolved in reverse DNS?

No. PTR records must be explicitly created by the organization or ISP that owns the IP address subnet. If the network provider has not configured a PTR record, the reverse lookup will return empty.

How do I configure Reverse DNS for my server?

Contact your cloud hosting provider (e.g., AWS, DigitalOcean, Hetzner, Linode) or ISP. Most providers offer a control panel setting to specify a PTR record matching your mail domain (e.g., mail.yourdomain.com).