1
Also covers dns lookup, domain ip dns, and open source · same kind of open-source project
Cloudflare DDNS Updater updates dynamic DNS records so users can reach a home network through a custom domain.
Alternatives
The Best wtfis Alternatives in 2026
24 alternatives1 free · 4 open source
Looking for something like wtfis? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 4 are open source.
wtfis gathers passive hostname, domain, and IP information from public sources.
Top picks at a glance
First suggestionCloudFlare DDNS UpdaterCloudflare DDNS Updater updates dynamic DNS records so…Free or freemium optionCloudflare DNSCloudflare DNS provides public DNS resolution and…Another optionDnsecureConfigure DNS over HTTPS or DNS over TLS on iOS, iPadOS…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | CloudFlare DDNS Updater | — | Yes | Linux, macOS |
| 2 | Dnsecure | — | Yes | iOS, macOS |
| 3 | Cloudflare DNS | Free | Not stated | Web |
| 4 | Mullvad DNS | — | Not stated | Android, iOS, Linux |
| 5 | Whois | — | Not stated | — |
| 6 | SubDomainizer | — | Yes | — |
| 7 | metabigor | — | Yes | — |
| 8 | Google Transparency Report | — | Not stated | Web |
| 9 | Whoxy | Paid | Not stated | Web |
| 10 | Website Information | — | Not stated | Web |
All wtfis alternatives
2
Also covers dns lookup, domain ip dns, and open source · same kind of open-source project
Configure DNS over HTTPS or DNS over TLS on iOS, iPadOS, and macOS with DNSecure.
3
Also covers dns lookup and domain ip dns · free
Cloudflare DNS provides public DNS resolution and authoritative DNS services.
4
Mullvad DNS
mullvad.net/en/help/dns-over-https-and-dns-ove…Also covers dns lookup and domain ip dns
Configure encrypted DNS with Mullvad’s public DoH and DoT service, scheduled to end on November 2, 2026.
5
Whois
github.com/b1s4/whoisAlso covers dns lookup and domain ip dns · same kind of open-source project
This Whois command-line tool looks up DNS and RDAP records for a domain.
6
Also covers dns lookup and domain ip dns · same kind of open-source project
SubDomainizer searches web pages, folders, and JavaScript files for subdomains and related information.
7
Also covers dns lookup and domain ip dns · same kind of open-source project
metabigor collects open source intelligence about internet assets without requiring API keys for its workflow.
8
Also covers dns lookup and domain ip dns
Google Transparency Report publishes data about requests and activity affecting Google services.
9
Also covers dns lookup and domain ip dns
Whoxy provides a WHOIS API for looking up domain registration records from a database of historical records.
10
Website Information
one-plus.github.io/WebsiteInformationAlso covers dns lookup and domain ip dns
OSINT Toolkit page listing website, IP, domain, email and MAC lookup tools; some tools need a known identifier to run.
11
IWantMyName
iwantmyname.comAlso covers dns lookup and domain ip dns
IWantMyName registers domain names across more than 500 extensions and offers related plugins.
12
Domainr
domainr.comAlso covers dns lookup and domain ip dns
Domainr searches domain names and provides an API covering top-level domains.
13
InstantDomain
instantdomainsearch.comAlso covers dns lookup and domain ip dns
Search domain names and check availability across more than 800 extensions with InstantDomain.
14
RDAP
client.rdap.orgAlso covers dns lookup and domain ip dns
Look up domain, IP, autonomous system, and entity records with RDAP.org RDAP-based lookup tool.
15
dnslytics
dnslytics.comAlso covers dns lookup and domain ip dns
DNSlytics provides reverse IP, NS, MX, WHOIS, and domain lookup tools.
16
SD Finder
subdomainfinder.c99.nlAlso covers dns lookup and domain ip dns
Scan a domain for subdomains with Subdomain Finder, which offers private scans that are not logged or indexed.
17
Also covers dns lookup and domain ip dns
Check domain registration details and availability with Whois.com, which also sells domain names and hosting.
18
IANA — Root Zone Database
iana.org/domains/root/dbAlso covers dns lookup and domain ip dns
IANA Root Zone Database lists delegation details for top-level domains in the DNS root.
19
DomainTyper
domaintyper.comAlso covers dns lookup and domain ip dns
DomainTyper searches for available domain names across extensions as users type.
20
digger.tools
digger.toolsAlso covers dns lookup and domain ip dns
Domain Digger looks up DNS, WHOIS, IP data, SSL history, and subdomains for a domain.
21
Pyfunceble
pyfunceble.github.ioAlso covers dns lookup and domain ip dns
PyFunceble checks whether domains, IP addresses, and URLs are available or syntactically valid.
22
Domain Tools
whois.domaintools.comAlso covers dns lookup and domain ip dns
DomainTools provides WHOIS lookups, domain availability searches, IP history, traffic data, and other domain research information.
23
Whois Search
webwhois.verisign.com/webwhois-ui/index.jsp?la…Also covers dns lookup and domain ip dns
Verisign Whois Search provides information about domain name registrations, including .com and .net records.
24
whois
whois.b1s4.xyzAlso covers dns lookup and domain ip dns
Look up DNS records and RDAP domain information with whois_, which supports common record types and network entities.
No alternatives match this filter.
Alternatives to similar tools
Google Transparency Report24 alternativesCloudflare DNS24 alternativesMullvad DNS24 alternativesCloudFlare DDNS Updater24 alternativesWebsite Information24 alternativesIWantMyName24 alternatives
What is the best alternative to wtfis?
Based on features, tags and platforms, the closest alternatives to wtfis are CloudFlare DDNS Updater, Dnsecure, and Cloudflare DNS.
Is there a free alternative to wtfis?
Yes. Cloudflare DNS is free or offer a free plan.
Are there open-source alternatives to wtfis?
Yes: CloudFlare DDNS Updater, Dnsecure, SubDomainizer, and metabigor.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative