ussan.org

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

85/100

Registered

Dec 24, 1997

28 years old · CSC Corporate Domains, Inc.

1 of 2 safety checks passed (Sep 20, 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

Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.

Authority & Safety, with the evidence

How this is scored →

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 unexpired threat-feed result; name-similarity check available (recorded about 11 days ago); 3/3 transport and email checks available (oldest recorded about 11 days ago). This is evidence coverage, not a probability that a website is safe.

Recorded HTTPS check did not confirm a valid connection
No MX and no DMARC (mild)

Site history

Dated record — historical facts always carry their date.

1997
Domain registered (Dec 24, 1997).
2026
Checked today — 1 of 2 safety checks passed (Sep 20, 2026).

✓ domain continuity 28 years registered✓ live verified Sep 20, 2026

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