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The Domain Dictionary.

Clear, precise definitions of the terminology used across domain investing, brokerage, and policy. A living reference maintained by the editorial desk.

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Legal

UDRP — Uniform Domain-Name Dispute-Resolution Policy

An ICANN policy establishing a streamlined arbitration process for resolving trademark-based domain disputes. Rights holders can file complaints with approved providers such as WIPO or the ADR Forum to seek transfer or cancellation of a domain.

Extensions

ccTLD — Country Code Top-Level Domain

A two-letter domain extension assigned to a country or territory, such as .io, .ai, .de, or .co. Many ccTLDs are marketed globally independent of their geographic origin.

Extensions

gTLD — Generic Top-Level Domain

A general-purpose domain extension such as .com, .net, or .org, as well as newer additions like .app and .tech introduced through ICANN's expansion programs.

Technical

WHOIS

A protocol for querying registration data about a domain, including registrant and dates. Much WHOIS data has been redacted since GDPR, replaced in part by the RDAP protocol.

Monetization

Domain Parking

Monetizing an undeveloped domain by displaying pay-per-click advertising. Revenue depends on the type-in traffic and ad relevance the domain attracts.

Market

Aftermarket

The secondary market where previously registered domains are bought and sold, as distinct from primary hand-registration at base prices.

Acquisition

Drop Catching

The practice of registering a domain the moment it expires and is released, typically using automated services that race to capture high-value drops.

Launch

Sunrise Period

A pre-launch registration window during a new TLD's rollout in which verified trademark holders can register matching names before general availability.

Legal

TMCH — Trademark Clearinghouse

A centralized ICANN database of verified trademarks used to support sunrise periods and trademark claims services during new TLD launches.

Valuation

EMD — Exact Match Domain

A domain that exactly matches a search keyword or phrase, historically valued for SEO and type-in traffic.

Valuation

Brandable

A domain valued for its suitability as a brand name rather than keyword relevance — typically short, pronounceable, and memorable invented words.

International

Pinyin

Domains composed of the romanized spelling of Chinese words, a major category in the Chinese aftermarket.

Categories

LLL / NNN

Shorthand for three-letter and three-number domains respectively. These fixed-length categories have established liquidity benchmarks, especially in .com and Chinese markets.

Metrics

Sell-Through Rate

The percentage of a portfolio that sells within a given period, a key measure of liquidity and pricing realism for domain investors.

Valuation

Floor Price

The lowest price at which a domain or category of domains is realistically expected to trade, based on comparable sales.

Market

End User

A buyer acquiring a domain to use for an actual business or project, rather than to resell. End-user sales typically command retail pricing.

Pricing

Wholesale Price

The price one investor would pay another, below retail, reflecting the margin needed for eventual resale.

Pricing

Retail Price

The full market price paid by an end user, typically substantially above wholesale.

Transactions

Escrow

A neutral third-party service that holds funds during a domain transaction until transfer is confirmed, protecting both buyer and seller.

Policy

ICANN

The Internet Corporation for Assigned Names and Numbers, the nonprofit coordinating the global DNS, IP allocation, and the introduction of new TLDs.

Infrastructure

Registry

The organization that operates a TLD's authoritative database and sets wholesale pricing — for example, Verisign for .com.

Infrastructure

Registrar

An ICANN-accredited company that sells domain registrations to the public on behalf of registries.

Infrastructure

Registrant

The individual or entity registered as the holder of a domain name.

Valuation

Premium Domain

A domain carrying above-standard pricing due to scarcity, keyword value, length, or commercial demand.

Legal

Cybersquatting

Registering domains in bad faith to profit from another party's trademark, the conduct targeted by the UDRP and laws like the ACPA.

Legal

Reverse Domain Hijacking

An attempt to deprive a legitimate registrant of a domain through a bad-faith UDRP complaint or trademark overreach.

Acquisition

Expired Domain

A domain whose registration has lapsed, often targeted for its existing backlinks, age, or brand value.

Acquisition

Backorder

Placing a request with a service to automatically acquire a domain if and when it drops.

Sales

BIN — Buy It Now

A fixed asking price at which a domain can be purchased immediately, as opposed to negotiating or bidding at auction.

Sales

Make Offer

A listing format inviting buyers to propose a price, opening a negotiation rather than stating a fixed figure.

Sales

Lander

A simple page placed on a domain to advertise it for sale and capture buyer inquiries.

Sales

Outbound Sales

Proactively contacting potential end users to sell a domain, rather than waiting for inbound inquiries.

Transactions

Lease-to-Own

A financing arrangement where a buyer pays in installments and gains full ownership once the total is paid.

Valuation

Appraisal

An estimate of a domain's value, produced by automated tools or human experts using comparable sales and market factors.

Valuation

Comparable (Comp)

A past sale of a similar domain used as a benchmark to estimate the value of another.

Technical

Auth Code (EPP)

A security code required to transfer a domain between registrars, protecting against unauthorized transfers.

Lifecycle

Redemption Period

A window after expiry during which the original registrant can still recover a domain, typically for an added fee, before it drops.

International

IDN — Internationalized Domain Name

A domain containing non-Latin characters, such as Chinese or Arabic scripts, encoded via Punycode in the DNS.

Market

Domainer

A person who buys and sells domains as an investment activity.

Market

Portfolio

The full collection of domains held by an investor or organization.

Economics

Renewal Fee

The recurring cost to keep a domain registered. For large portfolios, aggregate renewal costs — the burn rate — are a central economic concern.

Monetization

Type-In Traffic

Visitors who reach a domain by typing it directly into the browser, a key source of value for parked and exact-match domains.

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