1
Icann Lookup
lookup.icann.org/en/lookupAlso covers registration data · same kind of website
ICANN Lookup searches registration data for domain names and related internet number resources.
Alternatives
The Best Mark Monitor WHOIS Alternatives in 2026
9 alternatives2 free · 2 open source
Looking for something like Mark Monitor WHOIS? Here are 9 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 2 are free or have a free plan and 2 are open source.
About Mark Monitor WHOISwhois-webform.markmonitor.com/whois
VisitMarkMonitor WHOIS looks up domain registration records, with notices about contact information withheld for some registrations.
Top picks at a glance
First suggestionIcann LookupICANN Lookup searches registration data for domain names…Free or freemium optionViewDNS.infoViewDNS.info is a web-based collection of DNS, domain, and…Open source optionopenSquatopenSquat detects look-alike domains that resemble an…Another optionWho.isWho.is searches domain and website registration records…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Icann Lookup | — | Not stated | Web |
| 2 | Who.is | — | Not stated | Web |
| 3 | DomainRecon | — | Not stated | Web |
| 4 | ViewDNS.info | Freemium | Not stated | Web |
| 5 | digga | — | Not stated | Browser extension, Web |
| 6 | DNSai | — | Not stated | Web |
| 7 | DNS History | Freemium | Not stated | Web |
| 8 | openSquat | — | Yes | — |
| 9 | dnsx | — | Yes | — |
All Mark Monitor WHOIS alternatives
2
Who.is
who.isSame kind of website
Who.is searches domain and website registration records, including WHOIS, RDAP, DNS, and related information.
3
DomainRecon
kriztalz.sh/domain-reconSame kind of website
DomainRecon looks up DNS records, WHOIS details, SSL certificates, and IP addresses for a domain.
4
Same kind of website · free plan
ViewDNS.info is a web-based collection of DNS, domain, and IP lookup tools, including reverse IP, WHOIS, DNS records, subdomain discovery, port scanning, and traceroute. It also offers an API for domain and IP data.
5
digga
digga.devSame kind of website
Research a domain’s DNS records, RDAP, WHOIS, subdomains, IP addresses, and email security in one report.
6
DNSai
dnsai.com/dns-toolsSame kind of website
DNSai provides DNS lookups and analysis tools for records, WHOIS, blacklists, email authentication, and domains.
7
Same kind of website · free plan
DNS History stores historical DNS records, allowing users to review past domain and infrastructure changes.
8
Open source
openSquat detects look-alike domains that resemble an organization’s legitimate domains, helping identify possible impersonation.
9
Open source
dnsx provides a fast DNS reconnaissance toolkit for resolving records and collecting DNS information from domains.
No alternatives match this filter.
Alternatives to similar tools
openSquat12 alternativesWho.is9 alternativesdnsx12 alternativesDNS History9 alternativesViewDNS.info17 alternativesDomainRecon17 alternatives
What is the best alternative to Mark Monitor WHOIS?
Based on features, tags and platforms, the closest alternatives to Mark Monitor WHOIS are Icann Lookup, Who.is, and DomainRecon.
Is there a free alternative to Mark Monitor WHOIS?
Yes. ViewDNS.info and DNS History are free or offer a free plan.
Are there open-source alternatives to Mark Monitor WHOIS?
Yes: openSquat and dnsx.
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