.at is the country domain used in Austria. Across 15,222 .at addresses verified by BounceZero between April and October 2026, 8.5% were invalid, 1.5% catch-all, 29.1% unknown and 53.4% confirmed valid. Catch-all and unknown together mean a large share cannot be confirmed.
Every .at 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 |
|---|---|---|---|---|---|
| .at | 15,222 | 8.5% | 1.5% | 29.1% | 53.4% |
| 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 .at row: 7.4%.
Austrian lists mix business domains with German-speaking ISP mailboxes that defer probes, so the unknown share is elevated.
Austrian lists combine company domains with German-speaking ISP mailboxes that defer probes, so the unknown share is elevated as in Germany. Austrian law, like Germany's, requires prior consent for commercial email to anyone, which makes phone and LinkedIn the primary cold channels and verification the hygiene step for consented lists. Austrian company domains are mostly .at with a growing share of .com among startups in Vienna and Graz, and they verify at rates close to the European business average. The ISP share, led by A1 and Magenta mailboxes plus German freemail, is where the unknowns sit. For an Austrian list the split between company domain and consumer mailbox decides both the lawful basis and the reachable share, and verification should run after that split so the two groups are judged separately.
On confirmed-invalid rate, .at ranks 19 of 23 country domains in the corpus, just behind .ch at 9.3%, ahead of .fi at 4.6%.
On unknown rate, .at ranks 4 of 23 country domains in the corpus, just behind .ch at 36.0%, ahead of .net at 28.8%.
On confirmed-valid share, .at ranks 9 of 23 country domains in the corpus, just behind .ca at 54.4%, ahead of .ae at 47.7%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of .at 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.
About one in 3 .at addresses cannot be confirmed either way. That is gateway behaviour, not a verdict; route those contacts to phone or LinkedIn and re-check after a week.
Confirmed invalid is low at 8.5%, better than the business-list average of 14.5%.
Catch-all is negligible on .at (1.5%); when this provider does return valid, the mailbox accepted the probe itself rather than a blanket accept.
Just over 53% 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.
Plan a second channel for unknowns, as for Germany.
Role addresses such as info@ and sales@ make up 56.0% of .at addresses in the corpus. Role addresses rarely reach a person; prefer named contacts.
8.5% of 15,222 .at addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
29.1%. 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: 1.5% of .at addresses sat behind a catch-all accept, so the server took any address and the mailbox could not be confirmed.
53.4% 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 .at 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
1,178,297 Alice (TIM) addresses verified April to October 2026
33,275 AOL addresses verified April to October 2026
421,292 AT&T addresses verified April to October 2026
560,378 .au addresses verified April to October 2026
47,494 Bbox (Bouygues Telecom) addresses verified April to October 2026
28,040 .be addresses verified April to October 2026
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