How many referring domains do harvard.edu and mit.edu have?

harvard.edu has 259,772 referring domains and mit.edu has 170,353 in the Common Crawl web graph (release cc-main-2026-jul-aug-sep).

harvard.edu vs mit.edu: domain authority

harvard.edu has the higher authority score (81 vs 78) and harvard.edu has 1.5 times as many referring domains. Both are among the highest-authority education sites in our data (2026-10-03).

Metric	harvard.edu	mit.edu
Authority score (0-100)	81	78
Referring domains	259,772	170,353
Web graph rank	#78	#239
PageRank position	#315	#388
Majestic Million rank	#111	#102
Traffic rank	Top 50K websites (Chrome)	Top 1K websites (Chrome)

Bold = the stronger value. Ranks: lower is better.

Tech stack and AI crawler policy

	harvard.edu	mit.edu
Tech stack	WordPress, jQuery, Parse.ly, Google Tag Manager and Nginx	Drupal, Modernizr, Google Tag Manager, Apache HTTP Server and PHP
AI crawler policy	Open; GPTBot allowed	Open; GPTBot allowed

More harvard.edu comparisons

How the authority score is calculated

The score is the average of two parts, each from 0 to 100:

Rank part: 100 × (1 − log10(rank) / log10(N))^0.6, where rank is the domain's harmonic centrality position in the Common Crawl web graph (how close it is to every other domain through links) and N is the number of ranked domains (133,241,980).
Link part: 100 × log10(1 + referring domains) / 7, so 10 million referring domains = 100.

It is consistent across all 120 million domains in the data, so it is good for ranking and filtering lists. It is not Moz Domain Authority or Ahrefs Domain Rating. Referring domains count other domains that link to this one, not individual backlinks; no list of linking pages is included.

FAQ

Which has higher domain authority, harvard.edu or mit.edu?: harvard.edu has the higher authority score (81 vs 78) and harvard.edu has 1.5 times as many referring domains. Both are among the highest-authority education sites in our data (2026-10-03). Scores are from our open-data metric (0-100), not Moz DA or Ahrefs DR.
How many referring domains do harvard.edu and mit.edu have?: harvard.edu has 259,772 referring domains and mit.edu has 170,353 in the Common Crawl web graph (release cc-main-2026-jul-aug-sep).