iamroot.tech logoiamroot.tech
  • iamroot.tech
  • Frontpage
  • API
  • Newsletter
  • Donations
  • About
  • Monitoring system
  • Read more / signup
  • Login
  • Monitoring
  • Login
  • iamroot.tech
    • API
    • Newsletter
    • Donations
    • About
  • API Newsletter About Donations
  • Monitoring system
    • Read more / signup
    • Login
  • DNS & Domain Tools
    • Icon for DNS lookupDNS lookup
    • Icon for DNS propagation checkDNS propagation check
    • Icon for WHOIS / RDAP lookupWHOIS / RDAP lookup
    • Icon for Reverse DNSReverse DNS
  • Network & Routing Tools
    • Icon for Port scan + probeingPort scan + probeing
    • Icon for CIDR calculatorCIDR calculator
    • Icon for ASN database lookupASN database lookup
    • Icon for GeoIP locationGeoIP location
    • Icon for Ping / traceroutePing / traceroute
    • Icon for Connection & service tester (TCP/UDP)Connection & service tester (TCP/UDP)
      beta
  • Web & Developer Tools
    • Icon for HTTP/S request toolHTTP/S request tool
    • Icon for TLS/SSL certificate checkTLS/SSL certificate check
    • Icon for URL encode/decodeURL encode/decode
    • Icon for HTML encode/decodeHTML encode/decode
    • Icon for BASE64 encode/decodeBASE64 encode/decode
    • Icon for Hash calculatorHash calculator
    • Icon for Compression utilCompression util
    • Icon for What is my IPv4 and IPv6?What is my IPv4 and IPv6?
  • Email & Mail Server Tools
    • Icon for E-mail DNSBL blacklist checkE-mail DNSBL blacklist check
    • Icon for Reverse DNSReverse DNS
    • Icon for SPF multitoolSPF multitool
      beta
    • Icon for DKIM Key GeneratorDKIM Key Generator
      beta
    • Icon for DMARC check / generateDMARC check / generate
      beta
    • Icon for Mail header analyzerMail header analyzer
      beta
    • Icon for DMARC Report AnalyzerDMARC Report Analyzer
      beta
  • Utility Tools
    • Icon for Color contrast checker toolColor contrast checker
    • Icon for Color picker toolColor picker
    • Icon for Password generator toolPassword generator
    • Icon for Lorem ipsum generator toolLorem ipsum generator
    • Icon for World map, day/night + local time toolWorld map, day/night + local time
    • Icon for QR code generator toolQR code generator
Add to homescreen
Tap the 'Share button' at the bottom of the screen:



Scroll down the list, and select 'Add to Home Screen':

Tap the menu icon (3 dots - upper right-hand corner):



and select 'Add to homescreen'.:

Reverse DNS / PTR lookup

Related tools

DNS lookup
Online tool for advanced DNS lookups (nslookup / DIG-style). By default, it performs recursive queries against authoritative name servers - but custom DNS resolvers are supported too. Includes secondary records for a complete overview and provides a full technical log for debugging and insight.
DNS propagation check
Check how DNS records are propagated throughout the world. It will start by examining the authoritative name servers and compare the records with the results from over 20 DNS servers worldwide.
WHOIS / RDAP lookup
2602:ffb7:f00::
Port scan + probeing
2602:ffb7:f00::
E-mail DNSBL blacklist check
2602:ffb7:f00::
CIDR calculator
IP to CIDR calculation tool with subnet info. The reverse, CIDR ranges to IP addresses, is also possible. Last but not least, it includes a tool for refactoring groups of IPs, domain names, and/or other CIDR ranges.
GeoIP location
2602:ffb7:f00::
Ping / traceroute
2602:ffb7:f00::

Result

No PTR record :(

Unable to find any PTR-records for the specified domain/ip :(

Log

+001
  • Resolving PTR record of '2602:ffb7:f00::'
+2,168
  • ERRNo PTR record availible
    DNS server 'ns20.dns4pro.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.0.7.b.f.f.2.0.6.2.ip6.arpa'.

About

iamroot.tech is a toolbox for sysadmins, developers, and fellow nerds. It’s a personal pet project, coded and maintained alongside my day job as a full-stack developer and systems admin.

Everything is free, with no ads, signups, or credit cards required. The only exception is the monitoring platform, which needs a free account.

Feedback is always appreciated at iamrootdottech@gmail.com - otherwise, sign up for the newsletter, consider a donation, or read more on the About page.

Changelog

  • 2026-11-07: Monitoring system alerting overhaul
  • 2026-11-07: OAuth remake - adding Microsoft, Slack, Discord and GitHub
  • 2026-09-26: Monitoring system: Now supports teams and unlimited users per team
  • 2026-09-26: Another technical deep dive: Building boring failover without a load balancer
  • 2026-09-26: HTTP uptime monitor - specific host selection
  • 2026-09-26: Mail server prioritization fixed
  • 2026-09-26: Performance improvements
  • 2026-09-06: Front page and tool UI update
  • 2026-09-06: GeoIP database updated
  • 2026-08-31: Technical deep dive: Building database synchronization the boring way

Newsletter

Bi-weekly (at most) with updates, changelog and info from the website. Subscribe right here, or read more about the iamroot.tech newsletter.

Signup using GoogleSubscribe using Google
Signup using MicrosoftSubscribe using Microsoft
Signup using SlackSlack
Signup using DiscordDiscord
Signup using GitHubGitHub

OR

No personal information gathered anywhere. E-mail may be used for login and/or newsletter - will not be sold or used by anyone else but iamroot.tech. Cookies are in use for statistical and usability purposes. Trademarks property of their respective owners. A privacy policy and terms and conditions is availible if you like.

iamrootdottech@gmail.com
Bundgaard - Løvenørnsgade 35 - DK-8700 Horsens - Denmark

Shoutouts and credits to: Bootstrap, jQuery, Bootstrap live customizer by Virtuosoft, DnsClient.NET by MichaCo, LazyLoad by Mika Tuupola, the Olson tz database by IANA, Visible earth by NASA, GeoLite2 by MaxMind, Barcoder by Wouter Huysentruit, ICONS8, json-viewer by alenaksu, twelve.tools .


iamrootdottech@gmail.com
Bundgaard - Løvenørnsgade 56, 2tv - DK-8700 Horsens - Denmark

No personal information gathered anywhere. E-mail may be used for login and/or newsletter - will not be sold or used by anyone else but iamroot.tech. Cookies are in use for statistical and usability purposes. Trademarks property of their respective owners. A privacy policy and terms and conditions is availible if you like.

Shoutouts and credits to: Bootstrap, jQuery, Bootstrap live customizer by Virtuosoft, DnsClient.NET by MichaCo, LazyLoad by Mika Tuupola, the Olson tz database by IANA, Visible earth by NASA, GeoLite2 by MaxMind, Barcoder by Wouter Huysentruit, ICONS8, json-viewer by alenaksu, twelve.tools .

No personal information gathered anywhere. E-mail may be used for login and/or newsletter - will not be sold or used by anyone else but iamroot.tech. Cookies are in use for statistical and usability purposes. Trademarks property of their respective owners. A privacy policy and terms and conditions is availible if you like.

Bundgaard - Løvenørnsgade 56, 2tv - DK-8700 Horsens - Denmark
iamrootdottech@gmail.com

Got milk?

Because we've got cookies :)


We use cookies for statistical and usability purposes - and we interact with third party companies like Google. Read more at the privacy policy.

OK, got it
New features inbound 🚀
Within a couple of months, I'll launch a several new awesome features and tools. Signup for the newsletter to stay updated, and get early access as a beta tester.

Signup using Google  Microsoft  Slack  Discord  GitHub  or use this form.

Donations

Make a donation
(handled by PayPal)
Running these tools takes real resources. Servers, DNS hosting and whatnot... it all adds up. And while I do everything I can to keep costs down, even dirt-cheap hosting still costs money.

If you find the tools useful, a donation helps keep everything online, fast, and completely free of ads. It also opens the door to new tools, new locations, and better performance for everyone using the site.

To keep it as painless as possible, donations are handled through PayPal.

Thank you in advance.

/Flemming

PS: The least I can offer as a thank-you is an honorable mention, a backlink, and some SEO love. I will reach out after any donation.

usermodalLabel

usermodalContent
Close Done