the internet code for Eritrea is - ".er".
Information about .er domains
There are estimated to be about 111 domains with .er suffix (2014).
The Intended use for .er domains is for entities connected with Eritrea.
Actual use: Very few in use; no known registry site.
The .er internet code was Introduced in 1996.
The Sponsoring Organisation for .er domains is "Eritrea Telecommunication Services Corporation (EriTel)".
Structure of .er ccTLD: Registrations are at third level beneath names such as .com.er and .org.er.
Registration restrictions of .er domain: Unknown.
Eritrea Telecommunication Services Corporation (EriTel)'s contact details - See link
You can see more details about the .er ccTLD in Wikipedia - See link
Number of Internet Users (2014)
Eritrea makes up 0.00% of the world's Internet users and it ranked on 173 place compared to other countries in the world.
According to data from internetlivestats.com there are 59,784 internet users in Eritrea, which makes up about 0.91% of Eritrea's population (6,536,176).
SOURCES OF INFORMATION
Domain Count Statistics for TLDs - See link