Companies similar to captaindns.com
Ranked by market relation, semantic similarity, web metadata, technology, category, and language signals.
Top 20 of 250,833,009 candidates
Search took 3001ms · hybrid similarity across Semantil company signals
| # | Domain & description | Country | Industry | Tech / Tier | Traffic | Similarity | Action |
|---|---|---|---|---|---|---|---|
| 1 |
SwissArmyTechTools — Free Technical Tools for IT Admins and Developers
Fast, free web tools for IT admins, developers, MSPs, and security professionals. Password generator, subnet calculator, DNS checker, IP...
|
United Kingdom | — |
Very low traffic
|
96.1% | similar profile | |
| 2 |
DNS & IP Tools, Developer & Webmaster Tools, Productivity Tools, SEO Tools
DNS, IP, Developer, Productivity and Network Tools are available. Variety of online tools such as Time Card calculator, Domain suggestion,...
|
United States | Domain Search Tools |
18.7M
very_high
|
93.3% | similar profile | |
| 3 |
NetTools - Free Network & IT Tools for Sysadmins
Free online networking tools: subnet calculator, DNS lookup, SSL checker, password generator, IP geolocation, email authentication tools,...
|
Cocos (Keeling) Islands | — |
Very low traffic
|
96.1% | similar profile | |
| 4 |
Free Email Deliverability Checker | TamingDNS
Free email deliverability checker. Scan SPF, DKIM, DMARC, MTA-STS, TLS-RPT, and blacklists. Identify and fix deliverability issues...
|
— |
Very low traffic
|
96.7% | similar profile | ||
| 5 |
NetDig — Free DNS, IP & Network Tools | DNS Lookup, Port Checker, WHOIS
Free online DNS lookup, IP address geolocation, port checker, WHOIS, SSL certificate checker, MX record lookup, SPF/DMARC checker, subnet...
|
— |
Very low traffic
|
96.5% | similar profile | ||
| 6 |
Free Developer Tools - Network, Email & Web Utilities | Tool Checkers
Tool Checkers offers free online developer utilities including MX Record Checker, HTTP Header Inspector, DNS tools, and more. Debug network...
|
Networking Toolboxes |
Very low traffic
|
95.9% | similar profile | ||
| 7 |
NSToolKit — Free Online Network Tools
Free online network tools: DNS lookup, WHOIS, ping, traceroute, SSL checker, and more.
|
— |
Very low traffic
|
95.9% | similar profile | ||
| 8 |
DMARCLY | Email Security, Authentication, Anti-Phishing, SPF, DKIM, DMARC...
DMARCLY helps stop email spoofing, phishing, spam, business email compromise, ransomware, and improves email deliverability.
|
United States | Cold Email Infrastructure |
1.1M
very_high
|
92.3% | similar profile | |
| 9 |
EasyDMARC | Your DMARC Journey Made Simple
Your smart DMARC reporting and monitoring platform. Ensure domain-level security and email deliverability with EasyDMARC’s DMARC, SPF, DKIM,...
|
United States | Networking Toolboxes |
2.0M
very_high
|
92% | similar profile | |
| 10 |
DomBrains - Domain, DNS, SSL & email tools + monitoring
Free tools to check SSL expiry, DMARC, SPF, DKIM, WHOIS, MX records and DNS propagation. Save your domains and get alerts before things...
|
— |
Very low traffic
|
95.5% | similar profile | ||
| 11 |
DNSnexus — DNS, Email, Network & Security Tools Hub + Guides
Explore 60+ infrastructure diagnostics tools across DNS, email authentication, network, webmaster, security, and IP workflows with...
|
— |
Very low traffic
|
94.9% | similar profile | ||
| 12 |
AllNetworkTools.com — Free Network, IP & Security Tools Online
Free network tools suite with Subnet Calculator, DNS Lookup, IP geolocation, Password Generator, SSL checker, DKIM validator, and more. No...
|
— |
Very low traffic
|
94.8% | similar profile | ||
| 13 |
DMARC Monitoring & Enforcement Platform | DMARCguard
DMARC monitoring and enforcement across 9 email auth protocols. Compliance scoring, PDF audit reports, and step-by-step remediation. Start...
|
— |
Very low traffic
|
94.7% | similar profile | ||
| 14 |
deepdig — DNS, TLS, WHOIS, mail & network diagnostics
Free, self-hostable network diagnostics: DNS propagation & DNSSEC, SSL/TLS analyzer, WHOIS, mail (SPF/DKIM/DMARC/MTA-STS), HTTP headers,...
|
Romania | — |
Very low traffic
|
94.5% | similar profile | |
| 15 |
GF.dev Geek Tools - Made by Geeks
A suite of free tools for developers and sysadmins. Check DNS, Security Headers, TTFB, and more.
|
— |
1.8M
very_high
|
91.8% | similar profile | ||
| 16 |
Free Network Tools Suite - DNS, IP, Port Scanner | y4yes
Access 10+ free network tools: DNS Lookup, IP Checker, Port Scanner, Ping Test, and SSL Checker. Fast, secure, no registration required.
|
— |
Very low traffic
|
94.6% | similar profile | ||
| 17 |
LookupThis — Look up anything.
Free DNS, WHOIS, SSL, and email diagnostic tools with plain-English explanations. Paste a domain, IP, or email and get instant results. No...
|
Iceland | — |
Very low traffic
|
94.4% | similar profile | |
| 18 |
IP Address Lookup - Check Location of Your Public IP
IPLocation.io provides a free IP lookup tool to check the location of your IP Address. Data is gathered through several GEO IP data...
|
United States | Networking Toolboxes |
823k
high
|
91.4% | similar profile | |
| 19 |
Smart Domain Check — Free link safety checker, email validator, DNS lookup, and...
Free tools to check links for spam and phishing, validate email addresses, unwrap short URLs, look up DNS records, WHOIS data, HTTP headers,...
|
— |
Very low traffic
|
94.5% | similar profile | ||
| 20 |
Home - Email Deliverability Tools
Email deliverability tools, DNS lookups, and diagnostics. MX, SPF, DKIM, DMARC checks with actionable fix advice.
|
— |
Very low traffic
|
94.5% | similar profile |
Similarity combines curated relation signals and semantic similarity from the Semantil company index.
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