IONOS / 1&1

Registrar DNS Serves 997,240 legacy-gTLD domains across 15 TLDs, 4.94% of all domains whose nameservers we can attribute. www.ionos.com/

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The registrar's own nameservers, used by default for domains that have not been pointed elsewhere — which includes both active sites and domains doing nothing at all.

How domains are attributed here

A domain counts towards IONOS / 1&1 when one of its nameservers ends in one of these suffixes. Matching is on the name in the zone's NS records only — nothing is resolved or fetched. Listed by weight, which is the order the classifier tries them in so a specific suffix beats a broader one.

Nameserver suffix	Weight
1and1-dns.com	10
ui-dns.biz	10
ui-dns.com	10
ui-dns.de	10
ui-dns.org	10

Where its domains are

997.24kzone, 19 Aug 2026

TLD share for IONOS / 1&1
.org	391.42k	39.25%
.net	285.38k	28.62%
.info	276.62k	27.74%
.biz	27,920	2.8%
.pro	7,520	0.75%
.cat	4,491	0.45%
.mobi	3,094	0.31%
.asia	646	0.06%
.aero	58	0.01%
.travel	45	<0.01%
Other5 more TLDs	53	0.01%

The ten largest of 15 TLDs, with the rest combined; all of them are in the table below.

Nameservers in use

as of 19 Aug 2026

The hostnames actually found in the zones, with how many domains name each. The suffixes above are the rule; these are what the rule matched. Counted across all gTLDs rather than the current scope, since the aggregate is built in one pass over every zone. Showing the fifteen largest.

Nameserver	Domains	Share of these
ns-de.1and1-dns.com	28,934	13.7%
ns1045.ui-dns.biz	22,724	10.8%
ns1016.ui-dns.biz	13,805	6.6%
ns1017.ui-dns.biz	13,319	6.3%
ns1021.ui-dns.biz	13,244	6.3%
ns1018.ui-dns.biz	13,016	6.2%
ns1019.ui-dns.biz	12,905	6.1%
ns1023.ui-dns.biz	12,108	5.7%
ns1020.ui-dns.biz	11,845	5.6%
ns1022.ui-dns.biz	11,805	5.6%
ns1024.ui-dns.biz	11,728	5.6%
ns-us.1and1-dns.com	11,636	5.5%
ns1025.ui-dns.biz	11,580	5.5%
ns1027.ui-dns.biz	11,239	5.3%
ns1018.ui-dns.com	10,739	5.1%

Shares are of the 210,627 domains on these 15 nameservers, not of the provider's 997,240.

TLDs served

as of 19 Aug 2026

TLD	Domains here	Share of this provider	Of the TLD
.org	391,423	39.25%	3.24%
.net	285,375	28.62%	2.31%
.info	276,615	27.74%	5.28%
.biz	27,920	2.8%	2.18%
.pro	7,520	0.75%	0.65%
.cat	4,491	0.45%	3.88%
.mobi	3,094	0.31%	1.24%
.asia	646	0.06%	0.09%
.aero	58	0.01%	0.42%
.travel	45	0%	0.16%
.coop	24	0%	0.29%
.tel	11	0%	0.03%
.jobs	8	0%	0.07%
.xxx	6	0%	0.02%
.museum	4	0%	0.37%

Data currency. Domain counts on this page are from zone files dated 19 August 2026 and refresh daily. Registrar figures are from ICANN's monthly registry reports for April 2026, which ICANN publishes about three months in arrears; zone files contain no registrar information, so no fresher source exists. Full detail on methodology and live pipeline status.