# Domain Checker: DNS & SSL — WHOIS, Email & Security Check

> WHOIS, Email & Security Check (iPhone/iPad app by 超 张.)

- Source: https://appshunter.io/ios/app/domain-checker-dns-and-ssl/id6792293532 (this page in markdown: same URL + `.md`)
- Developer: [超 张](https://appshunter.io/developer/1895478141)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-08-03
- Data updated: 2026-09-13
- User reviews in markdown: https://appshunter.io/ios/app/domain-checker-dns-and-ssl/id6792293532/reviews.md

## What is Domain Checker?

Domain Checker: DNS & SSL

Domain Checker is a domain diagnostic tool designed for developers, website administrators, and network professionals. Quickly analyze domain infrastructure with DNS lookup, SSL certificate inspection, HTTP response analysis, WHOIS information, and email security checks.

Simply enter a domain name to get a clear overview of its DNS configuration, certificate status, website response, and related services.

Key Features:
• DNS Record Lookup

Inspect common DNS records, including:

A
AAAA
CNAME
MX
TXT
NS
SOA
CAA

Verify domain resolution, DNS configuration, and service availability quickly.

• SSL Certificate Inspection

Analyze HTTPS certificates and security information, including:

Certificate issuer
Validity period
Expiration countdown
Subject Alternative Names (SAN)
Fingerprint
Public key information

Identify certificate expiration risks and configuration issues before they impact your services.

• HTTP Response Analysis

Check website availability and HTTP behavior:

HTTP status codes
Response headers
Redirect chains
Server information

Quickly troubleshoot website accessibility and configuration problems.

• WHOIS Domain Information

View public domain registration information:

Registrar
Registration date
Expiration date
Domain status
Name servers

Understand domain ownership and lifecycle information.

• Email Security Check

Analyze domain email-related DNS configuration:

MX records
SPF records
DMARC records

Identify email security configuration issues and improve domain reliability.

• All-in-One Domain Diagnostics

Perform essential domain checks from one clean interface without switching between multiple websites or online tools.

Whether you are troubleshooting DNS resolution, verifying SSL certificates, diagnosing HTTP issues, or reviewing domain configuration, Domain Checker helps you quickly understand your domain infrastructure.

Legal:

Terms of Use:
https://domain.opshome.run/terms/

Apple Standard EULA:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/Privacy Policy:
https://domain.opshome.run/privacy/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Domain Inspector Plus 50 | $0.99 | one-time |
| Domain Inspector Pro 100 | $1.99 | one-time |



## Version history (last 4 releases)

### 1.3 — 2026-09-07

1.  Improved domain connection and validation experience
2.  Enhanced DNS, SSL certificate, and WHOIS detection
3.  Improved email security checks
4.  Added clearer status feedback and error handling
5.  Improved overall stability and performance

### 1.2 — 2026-08-14

1. Improved domain check and refresh experience with faster status feedback.
2. Fixed an issue where Refresh All on the home screen could occasionally become unresponsive.
3. Improved the speed and stability of multi-domain batch checks.
4. Improved HTTPS and DNS checks in complex network environments.
5. Optimized automatic refresh logic to reduce unnecessary repeated checks.
6. Fixed various compatibility and stability issues.

### 1.1 — 2026-08-11

1. Improved HTTPS, TLS, DNS, and mail configuration checks.
2. Reduced false alerts for common Microsoft 365, Outlook, Google Workspace, and Tencent mail configurations.
3. Improved JSON backup export and full local data restore.
4. Improved local purchase entitlement handling for Plus and Pro.
5. Clarified DKIM scope: selector-based DKIM verification is not automatically performed.

### 1.0 — 2026-08-04

No release notes.

## More apps by 超 张

- [OpsHome NOC](https://appshunter.io/ios/app/opshome-noc/id6763890679)
- [SSL Reminder](https://appshunter.io/ios/app/ssl-reminder/id6786519365)
- [WiFi HealthCheck](https://appshunter.io/ios/app/wifi-healthcheck/id6791147190)
- [FortiGate NOC Monitor](https://appshunter.io/ios/app/fortigate-noc-monitor/id6796713266)

All apps by 超 张: https://appshunter.io/developer/1895478141

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-13.*