a2dns.com vs UltraDNS

UltraDNS is used by more websites in our catalog: 330 use a2dns.com and 2,243 use UltraDNS.

UltraDNS sites have the higher median Ahrefs Domain Rating (a2dns.com: 26, UltraDNS: 55).

Between 2026-06 and 2026-07, a2dns.com went from 0.04% to 0.04% of all tracked sites, while UltraDNS went from 0.32% to 0.25%. a2dns.com is gaining ground faster in our index.

No. A site runs a single DNS provider, so a2dns.com and UltraDNS 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.