A reference for domain and SEO terminology you will run into when searching, vetting, and buying aged or expired domains — standard industry vocabulary plus Karma.Domains-specific metrics.
- Karma.Domains metrics
- Domain names and lifecycle
- Buying and selling domains
- Registrars, registries, and extensions
- Wayback Machine and domain history
- Link metrics and backlink vocabulary
- Traffic, keywords, and index status
- SEO tactics and vetting
Karma.Domains metrics
Proprietary scores and signals built from Wayback Machine data and domain-name analysis. None of them are Google ranking factors; they are research and screening tools for expired-domain workflows.
Karma Score (content score)
A 0–100 score of content history quality derived from Wayback Machine snapshots. Also referred to as content score or karmascore in API responses (average_karma_score for the rolled-up value in a report).
The algorithm walks the domain's archived periods in sequence and applies content flags — positive signals (stable real content, thematic consistency) and negative signals (doorways, auto-generated text, sharp topic flips, parking). The final number reflects the accumulated balance over time, not a single snapshot.
Karma Score does not measure link authority or predict rankings. It answers: how clean or risky was what lived on this domain? Pairs naturally with link metrics — high DR with a toxic history is a common trap. More detail: Karma Score.
Karma Metric (domain metric)
A 0–100 score of domain durability and archive activity from Wayback crawl patterns: how long the site existed, how regularly it was archived, gaps in history, whether activity grew or faded. API field: karmametric / karma_metric.
Where link metrics (DA, DR, TF) describe the backlink graph today, Karma Metric describes presence and consistency over time — an alternative angle on "domain authority" without counting links. It is not a Google metric.
Intuitive split with Karma Score: Karma Metric ≈ how much life the domain had; Karma Score ≈ how trustworthy that life was. More detail: Karma Metric. To check Karma Metric on specific domains without a full report, use the free Domain Authority Checker (up to 10 domains per run, no signup).
Karma Brand Score (Brandscore)
A 0–100 score of domain-name brandability — how well the string works as a brand, independent of site history or SEO. Sub-scores cover pronounceability, memorability, uniqueness, and appeal, informed by the radio test and phonetic principles. API field: brandscore.
High Brand Score means the name is easy to say, spell, and remember; low scores often flag random character strings or awkward combinations. It does not replace Karma Score or link metrics when vetting drops for SEO reuse. More detail: Karma Brand Score.
AI Summary
An automatically generated narrative of a domain's Wayback history: what the site was about in each era, when language or topic shifted, whether redirects appeared. Written from archived content, not from keywords in the domain name.
The summary is produced before topical domain categories are assigned, so classification follows content evidence rather than the spelling of the name.
Domain category
A topical label assigned from archived content (finance, restaurants, gambling, health, and similar), usually via the AI Summary pipeline. Categories are used for niche filtering; they reflect what was hosted on the domain, not what the name suggests.
Content flags
Per-snapshot signals in the Karma Score model. Good flags mark stable, meaningful content; bad flags mark risk patterns — doorways, parasite pages, SEO spam, empty placeholders, prolonged parking. One bad period rarely kills a score; repeated or long-running negative patterns weigh heavily.
Detected patterns
Machine-readable tags attached to individual Wayback periods or snapshots — for example adult, crypto, or gambling themes. They feed Karma Score and appear in timeline chart data alongside language, HTTP codes, and per-period scores.
Domain names and lifecycle
Domain name
The human-readable address of a website (for example, example.com). It maps to an IP address through DNS and is registered through a registrar for a fixed term, usually one to ten years.
Expired domain
A domain whose registration period has ended and the owner did not renew it. After registrar grace and redemption windows, the name may be deleted and become available again — through auction, backorder, or open registration.
Dropped domain
A domain that has been deleted from the registry and released for registration. In practice, "drop" and "expired domain" are often used interchangeably, though technically a name can expire and still be in redemption before it actually drops.
Domain drop
The event when a deleted domain becomes registerable. Drop catchers, backorder services, and auction platforms compete for high-value names in the seconds around a drop.
Aged domain
A domain with a prior history on the web: old content, backlinks, sometimes residual traffic. Buyers use aged domains for rebuilds, 301 consolidation, or new projects on a name that already has signals. Registration age alone does not equal quality — what was hosted on the domain matters more.
Domain age
How long a domain has been registered, usually measured from the first WHOIS creation date. Long age can indicate stability, but spam or parking for ten years is still a liability. For Wayback-based age — first and last snapshot dates and capture history — use the free Domain Age Checker (up to 10 domains per run, no signup).
Grace period
A short window after expiry when the original owner can still renew at normal cost. The domain may stop resolving or show a registrar hold page.
Redemption period
A later stage after expiry when the owner can still recover the domain, often at a higher fee. If redemption passes without renewal, the name moves toward deletion and drop.
Buying and selling domains
Domain aftermarket
The secondary market for domains already owned by someone else — marketplaces, brokered sales, and registrar listing pages. Prices range from tens of dollars to seven figures for premium names.
Auction domain
A domain sold through timed bidding on a registrar or marketplace (GoDaddy Auctions, NameJet, DropCatch, and similar). Bidders compete until the lot closes; high-value drops often pass through auction before open registration.
Buy Now (BIN)
A fixed-price listing with no bidding. Common on marketplaces alongside auction inventory.
Backorder
A reservation placed before a domain drops, giving the backorder service a chance to register the name the moment it becomes available. Multiple backorders on the same name are resolved by registrar rules — not always first-come-first-served.
Drop catching
Automated registration of domains the instant they are released after deletion. Specialized services compete on speed and registry connections; valuable drops rarely sit in open registration for long.
Open registration
Standard first-come registration at list price after a name is fully available, with no auction or winning backorder involved.
Premium domain
A domain priced above normal registration fees because of length, keyword value, brandability, or extension desirability. Premium pricing can apply at initial registration or in the aftermarket.
Registrars, registries, and extensions
Registrar
A company accredited to sell and manage domain registrations (GoDaddy, Namecheap, Dynadot, and others). You pay the registrar; it talks to the registry on your behalf.
Registry
The authoritative operator of a top-level domain zone (Verisign for .com, PIR for .org, and so on). Registries set zone policies; registrars are your retail interface.
TLD (top-level domain)
The suffix after the final dot in a domain name — .com, .net, .org, and hundreds of others.
gTLD (generic top-level domain)
A TLD not tied to a single country — .com, .net, .org, .app, .blog, and the new gTLD wave launched since 2012.
ccTLD (country-code top-level domain)
A two-letter extension assigned to a country or territory — .de, .uk, .jp. Some ccTLDs (.io, .ai, .co) are widely used globally outside their geographic origin.
Wayback Machine and domain history
Wayback Machine
The Internet Archive's public cache of historical web pages. SEOs use it to see what a domain hosted years ago — content topic, language, redirects, and whether the site was real or placeholder.
Archive snapshot
One saved capture of a URL at a specific date and time. A domain's value is judged from a sequence of snapshots, not a single lucky capture. Bulk-check first and last snapshot dates with the Domain Age Checker.
Domain history (content history)
The record of what a domain published over its lifetime: topics, languages, redesigns, outages, spam phases, and ownership changes. Link metrics show the present; history shows whether the domain is safe to reuse.
Content change
A meaningful shift in page content between two points in time — new topic, new language, or a new site type. Frequent sharp changes often signal flip schemes or serial reuse.
Parking page
A placeholder with ads, a "domain for sale" notice, or a registrar default page instead of a real site. Domains parked for most of their life usually carry little editorial value.
Doorway page
A thin page built to rank for specific queries and funnel users elsewhere, not to serve real content. Doorway history is a strong negative signal when evaluating drops.
Redirect chain
A series of HTTP redirects from one URL to another, sometimes across several domains. Long off-topic chains in history suggest the name was used for manipulation or link passing.
301 redirect
A permanent HTTP redirect. Search engines typically consolidate ranking signals to the target URL. SEOs use 301s from an aged domain to a money site; unrelated historical 301 targets are a due-diligence red flag.
302 redirect
A temporary HTTP redirect. Unlike 301, it does not signal a permanent move; in archive history, patterns of 302s to third-party domains can indicate short-term hijacks or affiliate tricks.
HTTP 403 in archive
A "Forbidden" response captured in Wayback. Often means the live site blocked the crawler — common on some setups and worth checking manually before you buy.
Website ID (analytics fingerprint)
Tracking identifiers embedded in HTML — Google Analytics, Google Tag Manager, and similar. The same ID across unrelated domains can indicate a shared owner or network.
CJK content
Chinese, Japanese, or Korean text in archived pages. Relevant when you need Asian-language history or want to avoid domains whose past content does not match your market.
Link metrics and backlink vocabulary
Backlink
An inbound link from another website to a page on your domain. Backlinks remain a core off-page ranking signal; quality and relevance matter more than raw count.
Referring domain
A unique domain that links to the target at least once. One site with a thousand links counts as one referring domain.
Anchor text
The clickable words in a link. Anchor distribution (branded, exact-match, generic, naked URL) reveals whether a profile looks natural or over-optimized.
Link profile (backlink profile)
The full picture of inbound links: volume, referring domains, anchors, donor quality, topical mix, and spam patterns. A high DR with a toxic profile is a common trap on expired domains.
Link equity
Ranking value passed through links — sometimes called "link juice." A 301 from a clean aged domain can transfer equity to a target URL; a burned or irrelevant history may transfer little or add risk.
Domain Authority (DA)
Moz's 0–100 score estimating ranking potential from link data. Widely used as a quick screen on drops; it is third-party, not Google's metric. The free Domain Authority Checker returns DA, DR, and Karma Metric side by side for up to 10 domains.
Domain Rating (DR)
Ahrefs' 0–100 score of domain-level link strength. High DR on a drop with unrelated Wayback history is a classic false positive.
URL Rating (UR)
Ahrefs' page-level link strength score. On expired domains, homepage UR often matters more than domain-level DR when you plan to build on a specific URL.
Page Authority (PA)
Moz's page-level authority score, analogous to DA at URL scope. Useful when comparing the strength of a homepage versus inner pages on an aged domain.
Trust Flow (TF)
Majestic's 0–100 score weighting links by the trust of linking sites. Higher TF generally means links from more reputable sources.
Citation Flow (CF)
Majestic's 0–100 score reflecting link volume. A high CF with low TF can indicate a bloated or low-trust profile; the TF/CF ratio is a common quick check.
Spam Score
Moz's 0–100 estimate of spam-like link patterns on a site. Higher is worse; use it as one signal among many.
Open PageRank (OPR)
A public PageRank-style score on a 0–10 scale from open link-graph data. A lightweight authority reference when other metrics are missing.
Toxic backlinks
Links from spammy, hacked, or irrelevant sites that can harm trust or trigger manual actions. Expired domains with toxic donors need cleanup or avoidance, not blind 301s.
Traffic, keywords, and index status
Organic traffic
Visits from unpaid search results. On aged domains, residual organic traffic can mean the name still ranks for old queries — or that SimilarWeb-style estimates show historical demand.
Estimated Traffic Value (ETV)
A dollar estimate of what a site's organic keyword rankings would cost if bought via ads. Keyword-data providers use ETV to summarize ranking strength without listing every query.
Google index
The set of URLs Google has crawled and stored. A site:domain.com check shows whether pages from a drop still appear — sometimes useful for recovery speed, sometimes a sign of stale spam URLs.
SimilarWeb estimates
Third-party approximations of visits, geography, and traffic sources based on panel and clickstream data. Directionally useful on drops; not exact analytics.
SEO tactics and vetting
PBN (private blog network)
A group of sites built mainly to pass links to money sites. Domains with PBN-style history — topic flips, thin templates, redirect patterns — are high-risk purchases.
Brandable domain
A name chosen for sound and memorability rather than literal keywords (Stripe, Spotify) as opposed to an exact-match keyword domain. Investors and startups often filter drops for short, pronounceable brandables.
Exact Match Domain (EMD)
A domain that matches a target keyword phrase (cheapflights.com for "cheap flights"). Google's 2012 EMD update reduced the ranking bonus for low-quality exact-match sites; EMDs can still help relevance and type-in traffic when the history is clean.
Due diligence
The manual work before you buy: verify price and auction end time, confirm availability, read Wayback history, review top anchors and donors, check for penalties or trademark issues. Metrics narrow the list; diligence makes the call.