Mailbox Provider: nih.gov [ back to main ] Here's MX record breakdown data for nih.gov. Did you know? Domain nih.gov hosts mail for 11 of the top ten million domains. Here are the top 5000 domains hosted by nih.gov: Rank Domain MX Record MX Domain 1 nih.gov nihcesxway3.hub.nih.gov nih.gov 2 clinicaltrials.gov nihcesxway3.hub.nih.gov nih.gov 3 cancer.gov nihcesxway.hub.nih.gov nih.gov 4 hrsa.gov nihcesxway3.hub.nih.gov nih.gov 5 drugabuse.gov nihcesxway.hub.nih.gov nih.gov 6 alzheimers.gov nihcesxway.hub.nih.gov nih.gov 7 fnih.org nihcesxway3.hub.nih.gov nih.gov 8 arpa-h.gov nihcesxway3.hub.nih.gov nih.gov 9 collegedrinkingprevention.gov nihcesxway.hub.nih.gov nih.gov 10 nlm.gov nihcesxway3.hub.nih.gov nih.gov 11 docline.gov nihcesxway3.hub.nih.gov nih.gov This ranking is relative inside of top 10 million results. Find more information about the "top domains" data from host.io. DNS Snapshot date: June 2025 Page generated at: Fri Aug 1 21:23:30 CDT 2025