.mobi: The Mobile TLD Tim Berners-Lee Warned About — 964K Peak, Identity Digital, and a Namespace Responsive Design Killed

Open ferrari.mobi. You get an HTTP 301 to www.ferrari.com—a defensive redirect, not a mobile product. Open bmw.mobi, espn.mobi, or weather.mobi in mid-2026: no reliable resolution in DNS checks. The old guide listed BMW, Hilton, ESPN, Maxim, and GoDaddy as "notable sites using .mobi" without opening a terminal—then framed .mobi as a mobile-first TLD worth building on in 2026.

Tim Berners-Lee disagreed before the TLD existed. In April 2004 he wrote that .mobi would "have a drastically detrimental effect on the Web" by partitioning HTTP space into mobile and non-mobile segments, destroying device independence—the same URI should work on a laptop and a phone (W3C archive, April 2004). At WWW2006 in Edinburgh he still called it "a bad idea" while dotMobi marketed it as a trust mark (BBC, May 2006). Responsive web design, CSS media queries, and the iPhone ecosystem proved him right. The thin daily-TLD template this guide replaces never told that story.

The zone tells the rest. ICANN's economic case study documented 964,115 registrations at peak in September 2008, then decline—with early cohort renewal rates no higher than 37% (ICANN Phase II Report, December 2010). bgp.he.net counted 322,035 domains and 252,643 resolving A records on 27 July 2026. Pick your tracker; the arc is consistent: ~964K peak, ~320K base, net shrink for a decade-plus—with occasional promo-driven blips that do not restore the 2007 mobile-Web thesis.

Two layers: "mobile-only Internet" pitch vs one responsive Web

In IANA, .mobi is now a standard unsponsored gTLD operated by Identity Digital Limited (IANA delegation data). It launched as a sponsored namespace: dotMobi partnered with the W3C Mobile Web Initiative on best practices, shipped Ready.mobi scoring (1–5 mobile readiness grades), and ran mobiForge as a developer hub (Wikipedia / ICANNWiki). The pitch: a separate mobile Web with stripped graphics and fewer choices—"thematically consistent" with desktop, but on a different hostname.

March 30, 2017 changed the contract. ICANN renewed .mobi under a Base, Non-Sponsored Registry Agreement—same framework as post-2012 new gTLDs, without the original mobile-industry sponsorship structure (ICANN renewal, March 2017). Mobile compliance guidelines became recommendations, not registry enforcement. The TLD kept breathing; its reason to exist did not.

Google treats it as a normal gTLD. John Mueller's standing guidance: keywords in the TLD are not a ranking signal. A .mobi page ranks on content and links—not because the suffix whispers "mobile-friendly" to Search.

Who runs it: mTLD, Afilias, Identity Digital

Registry operator (2026): Identity Digital Limited (c/o Identity Digital Inc., Bellevue, WA) per IANA. RDAP: https://rdap.identitydigital.services/rdap/. Nameservers still carry afilias-nst labels—legacy infrastructure from the Afilias era.

| Era | Operator | Notes | |-----|----------|-------| | 2005–2010 | mTLD Top Level Domain, Ltd. ("dotMobi") | Consortium-backed launch: Google, Microsoft, Nokia, Samsung, Ericsson, Vodafone, GSM Association, Visa, and others (Wikipedia) | | Feb 2010 | Afilias Technologies Limited | Acquired mTLD; dotMobi became Afilias subsidiary (PR Newswire / dotMobi) | | 2021 | Identity Digital | Donuts + Afilias merger formed world's largest new-gTLD operator portfolio (TLDFYI) | | Sep 2025 | IANA record updated | Sponsoring org field now Identity Digital Limited (changed 2025-09-04) |

Do not write "Afilias operates .mobi" without the Identity Digital parent. Afilias is the acquired lineage; ICANN's 2026 delegation record names Identity Digital Limited.

2005–2008 launch: consortium hype, speculator gold rush, responsive counter-revolution

• 11 July 2005 — ICANN approves .mobi registry agreement with mTLD Top Level Domain, Ltd.
• 17 October 2005 — Delegated to the DNS root (IANA).
• May–September 2006 — Phased launch: mobile-industry sunrise, then general availability from 26 September 2006.
• May 2007 — dotMobi announces 500,000+ registrations across 104 countries (PR Newswire, May 2007). CEO told Reuters he expected one million by year-end 2007—the December 2007 registry report showed 802,455, ~20% short (ICANN economic report).
• September 2008 — Peak 964,115 registrations (ICANN economic report).
• December 2008 — Zone already sliding: 903,301 per HosterStats—68,946 deletions in one month.
• 2009–2015 — Responsive design goes mainstream; Ethan Marcotte's 2010 article and Bootstrap-era tooling make one URL for all devices the default engineering pattern.
• 2010 — Afilias acquires dotMobi registry.
• 2017 — Sponsored agreement ends; .mobi becomes unsponsored.
• September 2024 — Legacy .mobi WHOIS infrastructure allowed to expire, enabling fraudulent certificate issuance until patched (Ars Technica).

The investment window was 2006–2008, not 2026. DNJournal-documented .mobi sales cluster in that window—then thin out for fifteen years.

Zone size: peak, glide path, and promo blips

| Metric | Source / date | Figure | |--------|---------------|--------| | CEO target (missed) | Reuters / dotMobi, Dec 2007 | 802,455 actual vs 1,000,000 expected | | Documented peak | ICANN economic case study, Sep 2008 | 964,115 | | Post-peak slide | HosterStats zone file, Dec 2008 | 903,301 | | Early renewal rate | ICANN economic report | ≤37% of first GA cohort renewed at two years | | Resolving inventory | bgp.he.net, 27 Jul 2026 | 322,035 domains / 252,643 A records | | Promo-rebound cite | John Matson Consulting, 2025 | ~74% growth to ~415K—headline churn, not restored thesis | | Old guide fiction | Prior stub | "1M+ in first two years, still mobile-first" — misdated peak, unaudited |

The gap between ~322K registered and ~253K resolving is parked, defensive, and dead inventory—same pattern Harvard found in .biz, compressed into a smaller namespace. Model renewal at $40+, not $3 promo registration.

For macro TLD context, see Popular Domain Extensions in 2026.

Pricing: $3 promos, ~$42–$65 renewals, brutal year-two cliff

Identity Digital does not market .mobi the way it once pushed .info, but retail shelves tell the economics:

| Tier | Typical range (USD, mid-2026) | |------|------------------------------| | Retail new registration (1 yr) | $3.12–$4.48 (Porkbun/Namecheap-class promos) | | Retail renewal (1 yr) | $41.60–$64.98 (Porkbun $41.71; Namecheap $41.98; tracker variance on older SKUs) | | Transfer | $21–$55 (Spaceship promo transfers vs Namecheap list) | | 3-year total (promo trap) | Often $86–$135 when renewals hit |

Sources: Porkbun .mobi tracker (register $3.12, renew $41.71); Namecheap .mobi page (register $4.48, renew $41.98); Spaceship-class promos cited in prior registrar comparisons.

Delete the old guide's "$10–$50 standard / $100–$1,000 premium tiers" table without registry citation. The trap is familiar: cheap year one, $42+ year two—often more than .com renewal at discount registrars, for a suffix with weaker trust and thinner liquidity.

Aftermarket: verified 2006–2007 comps only

| Domain | Price | Source | |--------|-------|--------| | Sportsbook.mobi | $129,800 | DNJournal private sale, Jan 2007 | | Fun.mobi | $100,000 | DNJournal / Moniker TRAFFIC, Dec 2006 | | Hot.mobi | $40,000 | DNJournal / Moniker TRAFFIC, Dec 2006 | | Attorney.mobi | £11,966 (~$23,606) | DNJournal / Sedo, Dec 2006 | | Party.mobi | $13,000 | DNJournal / Moniker TRAFFIC, Dec 2006 | | BBB.mobi | $6,500 | DNJournal / Sedo, Dec 2006 | | Lenders.mobi | $5,200 | DNJournal / Sedo, Dec 2006 | | Campus.mobi | €2,481 (~$3,303) | DNJournal / Sedo, Dec 2006 | | Dealer.mobi | $3,050 | DNJournal / Sedo, Dec 2006 |

Delete without fresh comps: generic "$100–$20,000 aftermarket" bands and "still attracts buyers" investment advice. The liquidity event was TRAFFIC Vegas 2006, not registrar checkout in 2026.

Verified surfaces—and the brochure names to delete

Skip Fortune-500 lists without DNS checks. Mid-2026 verified behavior:

ferrari.mobi — HTTP 301 to www.ferrari.com. Trademark defense redirect, not a mobile experience.

amazon.mobi — HTTP 302 to Amazon's mobile landing path on amazon.com. Brand protection with a live redirect chain.

Counterexamples (do not sell as adoption): bmw.mobi, hilton.mobi, espn.mobi, godaddy.mobi, weather.mobi, time.mobi, travelosa.mobi (once Webby-nominated)—no reliable resolution in mid-2026 checks. The old guide's brand roster was inventory held, not sites built.

Where mobile actually lives: instagram.com, whatsapp.com, m.youtube.com—responsive paths on .com, not a parallel .mobi namespace.

Why responsive design made .mobi obsolete

Berners-Lee's 2004 argument was architectural, not aesthetic: one Web, one URI, many devices. dotMobi's counter was operational: mobile users need different pages, so give them different domains.

Engineering history sided with Berners-Lee:

1. CSS media queries (widely supported by 2010–2012) let one HTML document reflow from phone to desktop.
2. The iPhone (2007) shipped a full WebKit browser—not a WAP ghetto—making "mobile Web" synonymous with "the Web, on a phone."
3. Google's mobile-first indexing (2019+) evaluates page usability, not TLD letters.
4. Progressive Web Apps and native apps absorbed use cases dotMobi imagined for .mobi hostnames.

Ready.mobi scores and mobiForge tutorials became archaeology, not onboarding. Identity Digital keeps the TLD in its portfolio; no major carrier markets .mobi as essential in 2026.

SEO and AI search: standard gTLD, obsolete signal

Google does not penalize .mobi by suffix. It also grants no mobile-ranking bonus—early rumors of Google prioritizing .mobi in mobile SERPs died with universal responsive design.

For AI surfaces (ChatGPT Search, Perplexity, Google AI Overviews): models cite pages with authority and freshness, not gTLD semantics. No audited AIO preference exists for .mobi—delete schema-template paragraphs expecting citation dividends from a mobile label.

If SEO mechanics matter, read Does Your Domain Name Affect SEO?.

One routing question—not a who-should matrix

Skip symmetric columns. Ask:

Are you defending a 2005 namespace Berners-Lee called harmful—or building a product strangers will trust in 2026?

Choose .mobi when .com is taken, you need cheap defensive registration beside an existing brand, you are documenting mobile-Web history, or you run a niche project where the .mobi label is intentionally retro (rare).

Skip .mobi when user trust matters, cold email outbound is core GTM, you want one responsive site on .com, renewal economics must be modeled honestly, or investment liquidity is the goal—see .com Domain Guide instead.

Alternatives worth comparing:

• .com — Default namespace; one URL for all devices.
• .app — Google-operated, HSTS-preloaded product surface.
• .dev — Google-operated, HTTPS-enforced tooling.
• .io — Startup signal; separate sovereignty stack.
• .info — Identity Digital sibling; promo-rebound dynamics, different abuse profile.

FAQ

How many .mobi domains exist in 2026?

bgp.he.net tracked 322,035 names and 252,643 resolving A records on 27 July 2026—~66% below the 964,115 peak in September 2008. Not growing back to mobile-Web hype levels.

Who operates .mobi?

Identity Digital Limited (formed from Donuts + Afilias merger). Original path: mTLD/dotMobi → Afilias (2010) → Identity Digital (2021).

Is .mobi still required to be mobile-friendly?

No. Sponsored mobile standards ended with the March 2017 non-sponsored agreement. Best practice today: make every site mobile-friendly—regardless of TLD.

Did Tim Berners-Lee support .mobi?

No. He urged ICANN not to create it in 2004, called it "a bad idea" in 2006, and responsive design validated his device-independence argument.

What are verified .mobi aftermarket sales?

DNJournal-documented peaks include Sportsbook.mobi ($129,800, 2007), Fun.mobi ($100,000, 2006), Hot.mobi ($40,000, 2006), Attorney.mobi (~$23,606, 2006). Post-2008 public comps are sparse.

Should I register .mobi for SEO or AIO?

No special benefit. Mobile rankings follow page experience, not suffix choice. Delete AIO boilerplate expecting AI citation from a .mobi label.

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Stress-testing whether a 2005 mobile-only suffix still earns a line item—or whether a responsive .com covers every screen? Our domain search checks .mobi availability, premium tiers, and matching .com status in one pass—or read Domain Hacks before you inherit a namespace the Web's inventor argued would break the Web.