.us is the country domain used in United States (country-code domain). Across 10,998 .us addresses verified by BounceZero between April and October 2026, 34.1% were invalid, 13.6% catch-all, 21.9% unknown and 29.1% confirmed valid. The invalid share is far above the business average.
Every .us address BounceZero verified for customers between April and October 2026, beside the corpus benchmarks. The remainder of each row to 100% is risky and role results.
| Segment | Addresses | Invalid | Catch-all | Unknown | Confirmed valid |
|---|---|---|---|---|---|
| .us | 10,998 | 34.1% | 13.6% | 21.9% | 29.1% |
| All non-freemail domains (business and ISP) | 6,514,884 | 14.5% | 2.3% | 27.0% | 32.6% |
| Business domains only (consumer ISP and freemail excluded) | 1,269,919 | 22.9% | 9.4% | 22.5% | 40.3% |
| All freemail | 1,415,154 | 17.6% | 1.1% | 2.1% | 74.0% |
Non-freemail includes consumer ISP mailboxes; a business-only cut is on the benchmarks page. Method and every other cut: Lead List Quality Benchmarks 2026. Risky and role on the .us row: 1.4%.
Small, with a high invalid share and a high catch-all share; .us is used by small businesses and local government rather than by large companies, and small domains churn.
The .us country domain is small and used by local businesses, schools and local government rather than by large companies, and small domains churn when the business closes or moves to .com. The catch-all share is high because small hosting plans often accept any address, so finder guesses are unreliable. CAN-SPAM permits unsolicited business email with an opt-out, but the segment's bounce risk means it should be verified and sent at low volume.
On confirmed-invalid rate, .us ranks 2 of 23 country domains in the corpus, just behind .au at 36.5%, ahead of .edu at 32.8%.
On unknown rate, .us ranks 10 of 23 country domains in the corpus, just behind .gov at 22.1%, ahead of .edu at 18.5%.
On confirmed-valid share, .us ranks 19 of 23 country domains in the corpus, just behind .gov at 34.7%, ahead of .net at 19.9%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of .us mailboxes. Unknown and catch-all measure what verification could not confirm, which depends on the provider's gateway policy during the window as much as on the addresses. The lists are the ones customers chose to upload, so segments dominated by a few large uploads carry their age and source. Method and limitations: benchmarks page.
21.9% of .us probes come back unconfirmed. Treat them as a separate segment: no cold volume, a re-check in seven days, and a second channel if they stay unknown.
34.1% confirmed invalid is far above the 14.5% business average. A list with many .us addresses was compiled a long time ago.
Catch-all is the defining trait here: 13.6% of .us addresses accept anything, so finder guesses look valid and bounce later. Hold them out of cold sequences entirely.
Just over 29% confirmed valid: reachable today, re-verified before every send, since only 19.2% of addresses were still valid 90 days after a check in BounceZero's decay study.
Sample-verify before buying any .us list; the catch-all share means finder guesses are unreliable here.
Role addresses such as info@ and sales@ make up 6.0% of .us addresses in the corpus. Role addresses rarely reach a person; prefer named contacts.
34.1% of 10,998 .us addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
21.9%. Unknown means the mailbox could not be confirmed either way, usually because the gateway deferred the probe. BounceZero refunds unknown results; re-check after a week or use a second channel.
Partly: 13.6% of .us addresses sat behind a catch-all accept, so the server took any address and the mailbox could not be confirmed.
29.1% confirmed valid at verification time. Keep bounces under 2% and complaints under 0.3% on the send, and re-verify the segment before every send.
Upload the file and see valid, invalid, catch-all and unknown per row, with the .us segment against this benchmark. 100 free checks a month, unknowns refunded.
Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.
Invalid, catch-all and unknown rates per email provider and country domain, 2026
246,811 TPG addresses verified April to October 2026
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56,582 Windstream addresses verified April to October 2026
36,082 Xtra (Spark) addresses verified April to October 2026
21,081 Yahoo Mail addresses verified April to October 2026
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