SSL Certificate Checker — Server Diagnostic Tool

Network

SSL Certificate Checker is a server-based utility that checks issuer, subject, expiry, and remaining days for the tls certificate on port 443 from an entered 도메인.

SSL Certificate Checker

Server lookupSSRF protected

Utillica checks only public URLs or domains from the server. Localhost, private IPs, internal networks, and metadata hosts are blocked, and raw API errors are hidden.

Domain

What is it

SSL Certificate Checker fetches HTTP, DNS, robots.txt, sitemap, and Open Graph signals that are hard to inspect directly from a browser and summarizes them in a table. Localhost, private IPs, and internal networks are blocked for security, and results are a point-in-time reference.

Input URL or domain → server lookup → response status, headers, and metadata summary

How to use

1Enter the 도메인.
2Press lookup.
3Review status codes, records, headers, or metadata.

Reference

SSL Certificate Checker — Server Diagnostic Tool Reference
Input	Result
도메인	checks issuer, subject, expiry, and remaining days for the TLS certificate on port 443

Sources & standards

HTTP Semantics - IETF
The robots.txt file format - IETF
Sitemaps XML protocol - Sitemaps.org
The Open Graph protocol - Open Graph protocol
WHOIS Protocol Specification - IETF
The Transport Layer Security (TLS) Protocol Version 1.3 - IETF

FAQ

Can SSL Certificate Checker check localhost?

No. Localhost, private IPs, and internal network addresses are blocked to prevent server-side request forgery.

Are SSL Certificate Checker results live?

They are fetched by the server at request time. DNS, caches, redirects, and target server policies can change the result.