CENTR's DomainWire Global TLD Stat Report Q4 2016: "At the end of Q4 2016 there were 309.4 million domain names across all top-level domains (TLDs) globally*. Net growth over the quarter was around 1.03 million (0.3%) - a large decrease compared to previous quarters, mostly due to negative growth in legacy gTLDs but balanced by an overall increase in new gTLDs.
TLD Market Share – The 1,200+ recorded new gTLDs make up around 8% of the market, an increase of 0.8% over the previous quarter. Legacy gTLDs (17 TLDs) have seen a small reduction in market share due to the decreased domain volume. The 266 recorded ccTLDs represent a relatively unchanged 40% of the global market."  Excerpt from the report:

Compare above with .COM--Verisign info for .COM & .NET and Domain Name Industry Brief (DNIB) | Verisign.com

CENTR--Council of European National Top Level Domain Registries--centr.org

CENTR is the association of European country code top-level domain (ccTLD) registries, such as .de for Germany or .si for Slovenia. CENTR currently counts 53 full and 9 associate members – together, they are responsible for over 80% of all registered domain names worldwide.
 ccTLD – a Country Code Top-Level Domain (ccTLD) is a two-character top-level domain used and reserved for a country or dependent territory. Examples include .uk for the United Kingdom or .de for Germany.
gTLD – a Generic Top-Level Domain (gTLD) is a three-character or more top-level domain. When reporting on median and aggregated values of legacy TLDs, the following are used: .biz, .com, .info, .mobi, .net, .org, .pro, .name 
IDN – an Internationalised Domain Name is a domain that contains at least one label that is displayed in software applications, in whole or in part, in a language-specific script or alphabet, such as Arabic, Chinese, Cyrillic, Tamil, Hebrew or the Latin alphabet-based characters with diacritics or ligatures, such as French. A ccTLD IDN is an IDN at the top level – e.g., the ccTLD IDN for the Russian Federation is .PФ, which is the Cyrillic script version of .ru. 
Registrant – The individual or organisation that registers a specific domain name. A registrant holds the right to use that domain name for a specified period of time. 
Registry – An Internet domain name registry receives domain name information into a centralised database and transmits the information in Internet zone files so that domain names can be found by users around the world via the worldwide web and email. 
Market Share – TLD market share in European countries is calculated as follows: the geo location of registrants of ccTLD domains (source: CENTR) and gTLDs (source: Zooknic) are calculated as percentages over the total in each country. Market averages are calculated quarterly.

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