This source allows users to check whether a specific website is down and provides history data on down time and response time.
Conducted since 1987, and with a new methodology since 1998, this study publishes quarterly data on the number of Internet hosts, their distribution by top-level domain name, the top 100 host names, the top 100 second and third-level domain names, and domain server software distribution.
This UN agency is a rich source of data about the Internet—the full catalogue of publications can be found here} (http://www.itu.int/dms_pub/itu-s/opb/gen/S-GEN-CAT.OL-2015-PDF-E.pdf). It publishes its yearly report [ICT Facts and Figures with information on Internet users, access, broadband and mobile, pricing, and speed, plus the Yearbook of Statistics.
This source provides weekly data on websites performance and offers a series of indexes, by industry and by country or region, with information on response time, response rate, and outages. It also produces the Internet Health Report, a real time view of the performance (latency, availability, packet loss) of major US Tier 1 backbones.
This regional registry (RIR) provides data on IPv4, IPv6 and ANSs distribution by year and country in Latin America and the Caribbean.