With the assistance of its members and friends (especially AFNIC, RIPE, Paul Vixie, Duane Wessels, Peter Koch and Paul Hoffman) DNS-OARC has assembled a historical archive of the DNS root zone dating back to June 1999. This Root Zone Archive is a part of our larger project, the Zone File Repository.

Root Zone Trends

The following graph shows trends in the contents of the root zone:
(click for full size)
Plus an idea of how many TLDs have DS records: (click for full size)

Coverage

We are now archiving the root zone daily. As of July 2016 we have the following number of days for these years:
YearCount
19931
19941
199984
2000319
2001311
2002226
2003344
2004357
2005362
2006364
2007364
2008366
2009365
2010365
2011364
2012366
2013365
2014365
2015365
2016201...and counting.
If you have even older data that you can share, or can help fill in some of the gaps, please contact us.

Subversion Access

The Root Zone Archive data is available only to DNS-OARC members, either as raw zone files or as a Subversion repository. Members may access the repository using the OARC credentials at the following Subversion URL:
https://zfr.dns-oarc.net/root-zone
If you wanted to see what the root zone looked like on February 5th 2009, you would execute:
$ svn checkout \
  --username=oarcuser \
  '-r{2009-02-05}' \
  https://zfr.dns-oarc.net/root-zone
$ less root-zone/root.zone