.cs
.cs was for several years the country code top-level domain (ccTLD) for Czechoslovakia. However, the country split into the Czech Republic and Slovakia in 1993, and the two new countries were soon assigned their own ccTLDs: .cz and .sk respectively. The use of .cs was gradually phased out, and the ccTLD was deleted some time around January 1995.

.cs domain first appeared in Internet Assigned Numbers Authority tables in autumn 1990 and in June 1991 in RIPE list. In October 1991 first domain was registered (iac.cs - Institute of Applied Cybernetics in Bratislava), in February 1992 first hosts existed. As of December 1992 40 domains were registered, while maximum number of 114 registered domains was reached in November 1993 and February 1994.

Until the deletion of .yu in 2010, .cs was the most heavily used top-level domain ever to be deleted. Statistics from the RIPE Network Coordination Centre show that even in June 1994, after much of the conversion to .cz and .sk had been done, .cs still had over 2,300 hosts. By comparison, other deleted TLDs (.nato and .zr) may never have reached 10 hosts.

In July 2003, CS became the ISO 3166-1 code for Serbia and Montenegro ("Srbija i Crna Gora" in Serbian), and remained so until 2006, when the country split and the codes for domains .rs and .me were created. However, Serbia and Montenegro did not use .cs as its ccTLD, but continued instead to use the Yugoslavian ccTLD .yu until it finally expired on 30 March 2010.
Q42032
country code top-level domain
Concept
Q33946
Czechoslovakia
LOC
Q1059215
country split
EVE
Q213
Czech Republic
LOC
Q214
Slovakia
LOC
Q37531
.cz
LOC
Q41529
.sk
MEDIA
Q242540
Internet Assigned Numbers Authority
ORG
Q1504968
RIPE
ORG
Q44127
hosts
Concept
Q433723
.yu
MEDIA
Q14296
top-level domain
Concept
Q961012
RIPE Network Coordination Centre
ORG
Q44127
hosts
Concept
Q753137
.nato
Concept
Q434608
.zr
MEDIA
Q25275
ISO 3166-1
MEDIA
Q37024
Serbia and Montenegro
LOC
Q9299
Serbian
Concept
Q45155
.rs
MEDIA
Q43673
.me
MEDIA
Q36704
Yugoslavia
Concept
Q433723
.yu
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
Q159403
.cs
MEDIA
1993-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1993
DATE
1995-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
January 1995
DATE
1990-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1990
DATE
1991-06-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
June 1991
DATE
1991-10-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
October 1991
DATE
1992-02-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
February 1992
DATE
1992-12-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
December 1992
DATE
1993-11-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
November 1993
DATE
1994-02-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
February 1994
DATE
2010-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2010
DATE
1994-06-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
June 1994
DATE
2003-07-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
July 2003
DATE
3166-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
3166
DATE
2006-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2006
DATE
2010-03-30T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
30 March 2010
DATE
+40^^http://www.w3.org/2001/XMLSchema#decimal
40
NUMBER
+10^^http://www.w3.org/2001/XMLSchema#decimal
10
NUMBER
-1^^http://www.w3.org/2001/XMLSchema#decimal
-1
NUMBER
instance of
country
replaces
replaces
dissolved, abolished or demolished date
inception
different from
top-level Internet domain
top-level Internet domain
top-level Internet domain
country
country
official language
top-level Internet domain