Ahrefs is rebuilding its best-known metric, and about half of all sites will see their score fall. The company previewed Domain Rating 4 on November 5, with the new version rolling out in the Ahrefs interface on December 1. The headline changes are substantial: roughly half of sites lose their Domain Rating score under the new calculation, subdomains get separate scores instead of inheriting the root domain's, and spam domains see sharp drops — domains with a DR of 30 to 70 under the old system drop a median of about 15 to 20 points. The worked example in the announcement is Ahrefs' own help subdomain: help.ahrefs.com falls from DR 91 to 75 under DR4, because a subdomain no longer borrows the authority of the main site.
The subdomain change is the most consequential. Under previous versions of Domain Rating, a subdomain largely shared the root domain's score, which meant a new subdomain on a strong domain launched with a high DR it had not earned. DR4 scores subdomains on their own link profile, so help.ahrefs.com at 75 reflects its own links rather than ahrefs.com's. For large sites with many subdomains — docs, blogs, help centres, regional versions — the scores will now diverge, and some will diverge sharply.
The spam-domain drops are the other deliberate effect. Domains in the 30-to-70 range that owe their score to spammy links fall a median of 15 to 20 points, which is Ahrefs tightening the metric against manipulation. The overall result — about half of sites losing DR — is not a bug in the new version. It is the point: the old distribution was inflated, and the new one is meant to be harder to earn.
Domain Rating has always been a relative metric, not an absolute one: it ranks a site's link profile against the rest of the web. A change in the calculation resets the scale, which means old benchmarks stop meaning what they meant. A DR 50 today is not a DR 50 on December 1, and anyone reporting DR in a client report, a media kit or a sales deck needs to note the version and the date.
The practical consequence is a wave of re-education. Link sellers who quoted DR will have to requote. Agencies that set DR thresholds for prospects will have to reset them. And anyone who bought links based on a DR number will discover what those links are worth under a stricter calculation. None of that makes DR useless — it makes it a metric whose meaning has changed, and whose users need to change with it.
For link builders, DR4 is both a warning and an opportunity. The warning is against optimising for a single third-party number: a metric can be recalculated overnight, and a strategy built on it moves with it. The opportunity is that the new calculation rewards what good link building already does — earning links to the specific page and subdomain that deserve them, rather than borrowing authority from a root domain.
The subdomain change also reframes internal linking. If a help centre or a blog subdomain now stands on its own link profile, then earning links directly to those subdomains matters more than it did — and the internal links from the root domain matter differently too. Check your own subdomains under DR4 when it lands on December 1, and treat the new numbers as the baseline for the next era of prospecting.
The December 1 rollout date is also a deadline for anyone whose work depends on DR. Media kits, link-marketplace listings, agency reports and prospecting filters all carry DR numbers that will change overnight, and the professional response is to note the version alongside the number from now on — DR3 or DR4, and the date it was measured. The alternative is confusion: a client comparing a November report with a January report will see scores fall and assume something went wrong, when the only thing that changed was the ruler. A short explanatory note in the December reporting cycle will prevent that confusion, and the agencies that send it will look like the ones who saw the change coming — because they did.
Sources: Ahrefs Blog, November 5, 2026.
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