This is a list of current registry operators that ICANN has agreement with and since when they have been operating the respective gTLDs.
.com is operated by VeriSign since 1993 (VeriSign acquired Network Solutions in 2000)
.net is operated by VeriSign since 1993 (VeriSign acquired Network Solutions in 2000)
.org is operated by the Public Interest Registry since 2003
.info is operated by Afilias Limited since 2001
.biz is operated by NeuStar, Inc. since 2001
.xxx is operated by ICM Registry LLC since 2011
Current registry agreements duration:
.com 1 March 2006 – 30 November 2012 (This has been renewed for another 6 years)
.net 1 July 2011 – 1 July 2017
.org 18 December 2006 – 30 June 2013
.info 18 December 2006 – 31 December 2012
.biz 18 December 2006 – 31 December 2012
.xxx 30 March 2011 – 30 March 2021
All current gTLD Registry Agreements can be found here.
On the 28th of June 2012 the ICANN Board of Directors authorized the renewal of its agreement with Verisign for operation of .com. The proposed agreement for renewal of the 2006 .com Registry Agreement between ICANN and Verisign can be found here. The final agreement will be available here on December 1st.
.info and .biz agreements between the registries and ICANN are up for renewal in about 3 months and the .org agreement is up for renewal in about 9 months. No announcements have been made on these renewals.