The comprehensive A-Z reference for domain industry terminology. From registrar to WHOIS, parking to TTL — master every term you need to know about domain names.
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An additional domain name that can be hosted within the same hosting account as your primary domain, typically at no extra cost.
Related: Domain Hosting, Primary DomainA marketplace where previously registered domain names are sold, traded, or auctioned. Popular aftermarket platforms include Sedo, Afternic, and GoDaddy Auctions.
Related: Domain Broker, Secondary MarketA competitive bidding process where domain names are sold to the highest bidder. Can be forward (seller sets reserve) or reverse (buyer posts wanted domain requests).
Related: Domain Auction, EscrowAlso known as EPP code or transfer key. A unique code required to transfer a domain name between registrars, provided by the current registrar to the domain owner.
Related: Transfer, RegistrarAmerican Registry for Internet Numbers. The regional Internet registry responsible for IP address allocation in North America.
Related: IP Address, DNSA fixed price at which a domain is offered for immediate purchase, bypassing the auction or negotiation process.
Related: Auction, Make OfferThe percentage of visitors who leave a domain's landing page without taking action or visiting other pages, relevant for parked domains.
Related: Domain Parking, CPMA unique, memorable domain name that can be trademarked and branded. Unlike keyword domains, brandables are invented or unique names like Google or Twitter.
Related: Keyword Domain, Premium DomainRegistering multiple domain names at once, often at discounted rates. Many registrars offer bulk pricing tiers.
Related: Domain Registration, RegistrarTwo-letter top-level domains representing specific countries or territories (e.g., .us, .uk, .de, .ca, .io). Some ccTLDs have special status for global brands.
Related: TLD, gTLD, Domain ExtensionCanonical Name record. A DNS record that maps one domain name to another, allowing multiple domains to point to the same destination.
Related: DNS, A Record, DNS ManagementRevenue metric for parked domains. Represents earnings per 1,000 pageviews from advertising displayed on a parked domain.
Related: Domain Parking, PPCRegistering, trafficking, or using a domain name with bad faith intent to profit from another company's trademark. Illegal under the UDRP.
Related: UDRP, Trademark, TyposquattingThe global system that translates human-readable domain names into IP addresses that computers use to identify each other on the network.
Related: Nameserver, A Record, DNS PropagationThe time it takes for DNS changes to spread across all servers worldwide. Can take 0-72 hours depending on TTL settings and caching.
Related: DNS, TTL, NameserverThe length of time since a domain name was first registered. Older domains often have more SEO value and trust signals.
Related: Domain History, SEOThe process of estimating a domain name's market value based on factors like length, keywords, TLD, traffic, and comparable sales.
Related: Domain Valuation, Comparable SalesA search engine ranking score predicting how well a website will rank. Moz's DA and other metrics help evaluate domain quality.
Related: SEO, Backlinks, PageRankThe practice of buying domain names at lower prices and selling them at higher prices for profit. Also called domain investing or domain trading.
Related: Domain Investment, DomainerA domain name that combines letters across multiple parts to form a recognizable word. Example: youtu.be or del.icio.us.
Related: Brandable Domain, Exact MatchUnauthorized transfer of a domain name to another party without the owner's consent, often through social engineering or compromised credentials.
Related: Security, Transfer LockExtensible Provisioning Protocol code. The secure transfer authorization code required to move a domain between registrars, also called auth code or transfer key.
Related: Auth Code, Transfer, RegistrarA trusted third-party service that holds payment until a domain transfer is confirmed complete, protecting both buyer and seller in high-value transactions.
Related: Domain Transfer, Payment ProtectionA domain name that exactly matches a popular search query, like flowers.com for "flowers." Historically strong for SEO, now weighted against quality content.
Related: Keyword Domain, SEOThe date when a domain registration ends. Domains typically enter a grace period (30-60 days) before being released for public registration.
Related: Renewal, Redemption PeriodThe first notification sent by a registrar when a domain is approaching expiration, typically sent 30 days before the expiration date.
Related: Expiration, Renewal NoticeRedirecting one domain to another so visitors automatically see the destination domain when entering the original URL.
Related: 301 Redirect, URL RedirectTop-level domains that are not country-specific, including .com, .net, .org, .biz, .info, and newer extensions like .app, .io, .ai, .xyz.
Related: TLD, ccTLD, Domain ExtensionThe period after a domain expires during which the original owner can still renew at the standard rate. Typically 0-45 days depending on the registrar.
Related: Expiration, Redemption PeriodA popular domain registrar known for simple pricing and user-friendly interface, specializing in .com domains.
Related: Registrar, Domain RegistrationInternet Corporation for Assigned Names and Numbers. The nonprofit organization that coordinates the global domain name system and accredits registrars.
Related: Registrar, Registry, DNSAlso called WHOIS privacy. A service that hides the domain owner's personal contact information from public WHOIS databases.
Related: WHOIS, Privacy, GDPRThe search engine database of crawled and indexed web pages. A domain must be indexed to appear in search results.
Related: SEO, Crawling, Search EngineA feature allowing buyers to propose a specific purchase price for a domain listed as "Make Offer" rather than having a fixed BIN price.
Related: BIN, Negotiation, OfferA temporary reduction in a domain's listed price to attract buyers, common in domain marketplaces.
Related: BIN, Pricing, DiscountHTML elements that provide information about a webpage to search engines and visitors, including title, description, and keywords.
Related: SEO, Title Tag, HTMLA TLD that contains multiple dot-separated parts, like .co.uk (UK commercial entities) or .com.au (Australian commercial).
Related: TLD, ccTLDServers that translate domain names into IP addresses. The nameserver is where your DNS records are hosted and managed.
Related: DNS, A Record, DNS ManagementNew top-level domains launched since 2012, including .app, .io, .ai, .xyz, .club, .online, and hundreds of others.
Related: TLD, gTLD, Domain ExtensionNetwork Information Center. The organization responsible for domain registration within a specific TLD or region.
Related: Registry, ICANN, RegistrarOne-Label Exact Match Domain. A domain containing an exact match keyword plus one additional word, like "flowershop.com."
Related: EMD, Keyword DomainDomain operations, referring to the day-to-day management of domain portfolios including renewals, transfers, and DNS management.
Related: Portfolio ManagementDisplaying targeted ads on a domain to generate revenue when the domain isn't being used for an actual website. Revenue comes from CPM or PPC.
Related: CPM, PPC, Domain Landing PageA landing page for an unused domain displaying ads, "under construction" message, or links to the registrar's services.
Related: Domain Parking, PlaceholderThe final stage before a domain is released for public registration, occurring after the redemption period expires.
Related: Expiration, Redemption Period, DropA collection of domain names owned by an individual or company, often built for investment, brand protection, or development purposes.
Related: Domainer, Domain InvestmentAn advertising model where advertisers pay each time someone clicks an ad. Used in domain parking to generate revenue.
Related: CPM, Domain ParkingHigh-value domain names valued above registration cost, often short, keyword-rich, brandable, or with traffic/history.
Related: Domain Valuation, Brandable DomainA service that replaces the domain owner's personal information with proxy information in public WHOIS records.
Related: WHOIS Privacy, ID ProtectionA 30-day period after the grace period where the original owner can recover an expired domain by paying a redemption fee.
Related: Expiration, Grace PeriodThe individual or organization that owns and registers a domain name. The legal owner as listed in WHOIS.
Related: WHOIS, Domain OwnerAn ICANN-accredited company authorized to sell and manage domain names. Popular registrars include GoDaddy, Namecheap, and Google Domains.
Related: ICANN, Registry, Domain RegistrationThe organization that maintains the database for a specific TLD. For example, Verisign manages .com, PIR manages .org.
Related: ICANN, Registrar, TLDThe process of extending a domain's registration period, typically done annually or for multiple years.
Related: Expiration, Auto-RenewThe minimum price a seller sets for a domain in auction. The domain won't sell below this price.
Related: Auction, BINA search that reveals all domains registered to a specific person or organization by searching WHOIS records.
Related: WHOIS, Domain ResearchThe marketplace for buying and selling already-registered domain names, as opposed to new registrations from registrars.
Related: Aftermarket, Domain BrokerThe part of a domain name to the left of the TLD. In "google.com," "google" is the SLD and ".com" is the TLD.
Related: TLD, Domain StructureAn email authentication method that specifies which mail servers are authorized to send email for a domain, helping prevent email spoofing.
Related: Email, DNS, DKIMThe last part of a domain name after the final dot. Common TLDs include .com, .net, .org, .io, .ai, and country codes like .uk.
Related: gTLD, ccTLD, Domain ExtensionA legal registration protecting a brand name, logo, or slogan. Trademarks can be used to dispute domain names through UDRP.
Related: UDRP, CybersquattingMoving a domain name from one registrar to another, requiring an auth code and ICANN approval from the domain owner.
Related: Auth Code, Registrar, EPPA security feature that prevents unauthorized transfer of a domain to another registrar. Should be disabled before initiating a transfer.
Related: Security, TransferThe duration (in seconds) that a DNS record is cached before being refreshed. Lower values mean faster propagation of changes.
Related: DNS, DNS PropagationRegistering common misspellings of popular domains to capture traffic or for resale. Similar to cybersquatting but targeting typos.
Related: Cybersquatting, TyposA public database containing registration information for domain names, including the owner's name, contact details, and registration dates.
Related: ICANN, Registrant, PrivacyA service that replaces personal contact information in WHOIS with generic proxy information to protect the owner's privacy.
Related: WHOIS, ID Protection, PrivacyCommon questions about domain terminology
A registrar (like GoDaddy, Namecheap, or Google Domains) is an ICANN-accredited company that sells domain names directly to the public. A registry (like Verisign for .com or PIR for .org) is the organization that manages the master database for each TLD. Think of the registry as the wholesale warehouse and the registrar as the retail store.
DNS propagation can take anywhere from a few minutes to 72 hours. Most changes take effect within 4-24 hours. The time depends on the TTL (Time To Live) setting of your DNS records and caching by ISPs. Lower TTL values (like 300 seconds) propagate faster but require more maintenance.
After expiration, domains typically follow this timeline: Grace period (0-45 days) where you can renew at standard rates, Redemption period (30 days) where you pay a high fee to recover the domain, then Pending Delete (5 days) when the domain is being deleted. After pending delete, the domain becomes available for public registration.
They're essentially the same thing! WHOIS privacy (or ID protection) hides your personal contact information from the public WHOIS database, replacing it with proxy contact details. This prevents spam, identity theft, and unwanted solicitations while keeping your domain registration active and legal.
Premium domains command higher prices due to factors like: Short length (2-4 characters), high-value keywords (industry or product names), brandability (unique, memorable names), traffic (existing visitors), age (older domains have more SEO value), and extension (.com is most valuable). Premium doesn't mean better—it means more desirable and valuable.
To safely transfer a domain: 1) Disable the transfer lock on your current registrar, 2) Get the EPP/Auth code, 3) Initiate transfer at your new registrar, 4) Pay the transfer fee (usually one year renewal), 5) Approve the transfer via email. Always use escrow services like Escrow.com for high-value domain transactions to protect both parties.
Domain parking displays targeted ads on your unused domain, earning revenue from clicks (PPC) or impressions (CPM). Profitability varies widely—most parked domains earn $0.01-$5.00 per day, while high-traffic domains can earn hundreds. Parking works best for domains with existing traffic; new domains rarely generate significant income.
ICANN (Internet Corporation for Assigned Names and Numbers) is the global coordinator of the domain name system. They set policies, accredit registrars, manage TLD registries, and ensure the internet's unique identifier system operates securely and stably. Without ICANN, there would be no standardized domain name system.
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