U.S ISBN Agency - Welcome to the U.S. ISBN Agency, the official source for ISBNs in the United States.
The U.S. ISBN Agency is the official source for assigning ISBNs to publishers in the United States. It is the sole authority authorized to issue legitimate ISBNs to U.S. publishers, and Bowker provides technical guidance on ISBN standard usage to the publishing industry.
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Authority
—/100
Safety
82/100
Registered
Dec 24, 1997
28 years old · CSC Corporate Domains, Inc.
1 of 2 safety checks passed (Sep 5, 2026).
AboutUs has not vetted this site. 1 of 2 automated safety check did not pass. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.
Current facts
What AboutUs observed on the live site and in WHOIS/DNS today. These are measurements, not an endorsement of the site.
checked now
Domain registered Dec 24, 1997 — 28 years old.
checked now
Registrar today: CSC Corporate Domains, Inc. — unchanged since AboutUs began tracking (Aug 12, 2026).
Authority: not enough signals yetSome caution flags
Why we're not scoring this yet
We withhold an authority number until independent evidence (global rank, link-graph presence) has accrued. The facts we do have about this site are shown below — we'd rather say “not enough signals yet” than invent a low score.
Safety evidence
No valid HTTPS today
No MX and no DMARC (mild)
Site history
Dated record — historical facts always carry their date.