# DNS Checker/Whois & IP Lookup — Fast DNS, Whois & IP lookup.

> Fast DNS, Whois & IP lookup. (iPhone/iPad app by Yuan-Yi Chang.)

- Source: https://appshunter.io/ios/app/dns-checkerwhois-and-ip-lookup/id6772759469 (this page in markdown: same URL + `.md`)
- Developer: [Yuan-Yi Chang](https://appshunter.io/developer/784363421)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 36 MB
- Languages: American English
- Released: 2026-06-02
- Data updated: 2026-07-22
- User reviews in markdown: https://appshunter.io/ios/app/dns-checkerwhois-and-ip-lookup/id6772759469/reviews.md

## What is DNS Checker/Whois & IP Lookup?

DNS Checker/Whois & IP Lookup is the network reference your phone has been missing. Type any hostname and instantly see the A records returned by Google, Cloudflare, Quad9, Alibaba, and your device's own resolver — side by side. Type any domain and pull live Whois data from the authoritative registry. No accounts, no signup, no fluff.

WHY MULTIPLE RESOLVERS?

Different DNS servers can return different answers for the same name. ISPs rewrite responses, CDN edges return geo-specific IPs, captive portals lie. By querying several well-known resolvers in parallel and comparing the results in one screen, you can spot DNS rewrites, debug propagation delays, and verify that your records have actually rolled out worldwide — not just in your ISP's cache.

DNS LOOKUP

- Parallel A-record queries against curated public resolvers
- Includes the OS's configured local resolver for an apples-to-apples comparison
- Per-server latency so you can see who answered fastest
- Clear timeout / error markers when a resolver fails to respond
- Recent-queries history for one-tap rerun

WHOIS

- RFC 3912 client with IANA referral for accurate TLD-to-registry handoff
- Optional eTLD+1 normalisation: www.example.com is treated as example.com
- Shows registrar, creation / expiry / updated timestamps, EPP status codes, and authoritative name servers
- Raw response is always available for when you need the exact text

ONE-TAP HANDOFF TO COMPANION TOOLS

Found an interesting host? Pass it straight to a focused tool:

- Ping it with PingGrid Pro - Web Monitor
- Scan its ports with LANFinder - Ping & Port Scan
- Check its SSL/TLS certificate with SSL Certificate Checker

PRIVACY-FIRST DESIGN

- Your queries are sent only to the resolvers and Whois registries you are querying — never to us
- No accounts, no logins, no tracking pixels

POLISHED TO MATCH YOUR PHONE

- Native Material Design 3 user interface
- Light and dark themes that follow the system setting
- Localised in English, Traditional Chinese, Simplified Chinese, and Japanese

WHO IT IS FOR

- DevOps engineers and SREs verifying DNS propagation
- Web developers debugging CDN routing and caching
- Network administrators comparing ISP behaviour
- Anyone curious why a domain "is not working" on one device and works fine on another

DNS Checker/Whois & IP Lookup is fast, no-nonsense, and respects your privacy. Install it once and forget you ever struggled with nslookup on mobile.


## Version history (last 2 releases)

### 1.0.1 — 2026-07-14

- Performance improvements and a smoother startup experience.

### 1.0.0 — 2026-06-02

No release notes.

## More apps by Yuan-Yi Chang

- [PTT 鄉民樂 - 閃開！讓專業的來](https://appshunter.io/ios/app/ptt/id903371776)
- [DLNA for Chromecast](https://appshunter.io/ios/app/dlna-for-chromecast/id1060899923)
- [Apps for Chromecast: Web](https://appshunter.io/ios/app/apps-for-chromecast-web/id1387293690)
- [QRGo! QRCode Scanner&Generator](https://appshunter.io/ios/app/qrgo-qrcode-scanner-and-generator/id6755345245)
- [LANFinder: Ping & Port Scan](https://appshunter.io/ios/app/lanfinder-ping-and-port-scan/id6756230105)
- [Bastion SSH - SSH/SFTP Client](https://appshunter.io/ios/app/bastion-ssh-sshsftp-client/id6756718516)

All apps by Yuan-Yi Chang: https://appshunter.io/developer/784363421

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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 2026-07-22.*