DNS Checker/Whois & IP Lookup
Yuan-Yi Chang Utilities iPhoneiPadiPod touch
DNS Checker/Whois & IP Lookup is a free Utilities app for iPhone and iPad by Yuan-Yi Chang. Requires iOS 15.0. Updated September 30, 2026.
- Price
- Free
- on the App Store
- Size
- 36 MB
- Age 4+
- Updated
- Sep 30
- 2026 · v1.0.2
Screenshots
About 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.
What’s new
Version 1.0.2 · Updated September 30, 2026
- Smoother, more reliable experience with under-the-hood improvements.
App privacy
The developer, Yuan-Yi Chang, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers: User ID, Device ID
- Usage Data: Advertising Data
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Identifiers: User ID, Device ID
- Usage Data: Advertising Data
Used for: Developer’s Advertising or Marketing
Alternatives to DNS Checker/Whois & IP Lookup
Looking for apps like DNS Checker/Whois & IP Lookup? Here are 6 similar apps on the App Store. The highest rated is DNS Benchmark: Speed Test (4.7/5), and all 6 are free to download.
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DNS Benchmark: Speed Test
4.7
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DNS Optimizer: Server Changer
4.7
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DNS Changer: DNSCloak
4.6
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DNSecure
4.7
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iNetTools - Ping,DNS,Port Scan
4.6
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Net Optimizer : Optimize Ping
4.6
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| DNS Checker/Whois & IP Lookup | – | Free | September 30, 2026 | |
| DNS Benchmark: Speed Test | 4.7 / 5 (25) | Free | Aug 19, 2026 | Compare |
| DNS Optimizer: Server Changer | 4.7 / 5 (81) | Free | Jul 16, 2025 | Compare |
| DNS Changer: DNSCloak | 4.6 / 5 (178) | Free | Oct 19, 2026 | Compare |
| DNSecure | 4.7 / 5 (114) | Free | Dec 29, 2025 | Compare |
| iNetTools - Ping,DNS,Port Scan | 4.6 / 5 (5,681) | Free | Jun 23, 2026 | Compare |
| Net Optimizer : Optimize Ping | 4.6 / 5 (3,109) | Free | Jun 11, 2026 | Compare |