How to choose the best TLD for your business
Not sure which domain extension to pick? This guide covers every business type, budget, and geography to help you choose the right TLD.
Blog
Guides and insights on domain monitoring, WHOIS lookups, and brand protection.
UDRP domain dispute: how the process works, costs and timeline
The UDRP lets trademark holders recover bad-faith domains in 45-60 days for under $4,000. Learn the 3 conditions, the process, and realistic success rates.
Defensive domain registration: a strategic guide for brands
Registering domains you do not plan to use is a cost-effective brand protection strategy. Learn which TLDs and variants to cover, and where to stop.
How to spot a phishing domain: signs and detection methods
Phishing domains mimic real URLs to deceive users. Learn to read a suspicious URL, spot homoglyphs and misleading subdomains, and protect your brand.
Which domains should a brand register? A prioritized checklist
Not every domain variation is worth registering. A practical guide to picking the right TLDs and variants for your brand, by budget and risk level.
How lookalike domain detection works: algorithms and methods
Technical guide to detecting lookalike domains: Damerau-Levenshtein distance, homoglyph substitution, and structural pattern analysis with code examples.
Trademark domain protection: rights, conflicts and legal options
A trademark does not automatically give you domain rights. Learn what it covers, common conflicts, and how to reclaim a domain used in bad faith.
What is cybersquatting? Definition, examples and legal recourse
Cybersquatting is the bad-faith registration of a domain matching a brand name. Learn how it works, real cases, and how to fight back.
How to protect your brand with domain monitoring
Learn how to get automatic alerts when someone registers a domain similar to your brand name. Real-time RDAP monitoring explained.
Bulk WHOIS lookup: tools, scripts, and API methods
How to query WHOIS or RDAP for dozens or hundreds of domains at once. Web tools, a bash script with rate limiting, and a Python RDAP approach.
ICANN WHOIS: how to use the official lookup tool
ICANN Lookup is the official tool for checking domain registration data. Here is how to use it, what it shows, and where its limits are.
How to read domain registration data: fields and codes explained
What every WHOIS and RDAP field means: registrant vs registrar vs registry, EPP status codes, expiry dates, nameservers. A practical reference.
Domain registration history: how to find past owners
WHOIS only shows current data. To find past domain owners and registrar transfers, you need third-party archives. Here is where to look and what to check.
WHOIS privacy protection: what it hides and what it does not
WHOIS privacy protection replaces your personal contact data with a proxy service. Here is what it hides, what it cannot hide, and how to enable it.
How to do a WHOIS lookup: 3 methods explained
Three ways to look up WHOIS data for any domain: a web tool, the command line, and a direct RDAP query. Step-by-step with examples.
WHOIS vs RDAP: what changed and why it matters
RDAP is the modern replacement for WHOIS. Same data, but structured JSON over HTTPS instead of raw text on port 43. Here is what changed and why.
What is WHOIS? Domain registration data explained
WHOIS is a public database of domain registration records. Learn what a WHOIS record contains, what you can find, and how it works.
RDAP protocol explained: query domain data without parsing WHOIS
RDAP is the modern JSON API that replaced WHOIS for domain lookups. Learn how it works, how to query it, what fields it exposes, and which TLDs support it.
How domain availability checkers work: cache, WHOIS, and RDAP
Why do two domain checkers give different results? Learn how registrar caches, WHOIS, and RDAP work and what 'available' actually means before you try to register.
Domain watchlist: what it is and how to build an effective one
A domain watchlist monitors your domains continuously for expiration, status changes, and availability. Learn what to include and how to configure it in Domain Sentinel.
Detecting domain registration changes before they cause damage
Learn which RDAP fields change during a domain hijack, how to detect nameserver and registrar changes automatically, and how to respond within hours.
How to track domain expiration across multiple registrars
Centralize domain expiration tracking with RDAP-based alerts. Stop relying on registrar reminder emails and set configurable warnings at 90, 30, and 7 days.
Domain status codes explained: the complete EPP reference
Every domain EPP status code explained: clientTransferProhibited, serverHold, pendingDelete, and more. What each means and what you can do about it.
How to monitor competitor domains and detect brand threats
Track competitor domain registrations, nameserver changes, and look-alike domains with RDAP data. A practical guide to competitive domain intelligence.
Domain drop catching explained: how it works and when to use it
Domain drop catching lets services register expiring domains in milliseconds. Learn how it works, who it is for, and when a simple availability alert is enough.
Get notified when a domain becomes available
Set up a domain availability notification to know the instant a domain you want becomes free to register. How it works and when to use backorder instead.
How to set up domain monitoring alerts
Learn how to configure automated domain monitoring alerts for expiration, status changes, and availability, and why calendar reminders are not enough.