1and1.com vs ui-dns.biz

ui-dns.biz is used by more websites in our catalog: 270 use 1and1.com and 1,827 use ui-dns.biz.

1and1.com sites have the higher median Ahrefs Domain Rating (1and1.com: 27, ui-dns.biz: 22).

Between 2026-06 and 2026-07, 1and1.com went from 0.03% to 0.03% of all tracked sites, while ui-dns.biz went from 0.23% to 0.21%. 1and1.com is gaining ground faster in our index.

No. A site runs a single DNS provider, so 1and1.com and ui-dns.biz are mutually exclusive.

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.