Every extension,
A to Z.
Country codes, new generic extensions, .pk second levels and brand TLDs. Each one has a page with the price, who can register it, transfer rules and FAQs.
.sb is the official internet extension for Solomon Islands.
.sc is the official internet extension for Seychelles.
.sd is the official internet extension for Sudan.
.se is the official internet extension for Sweden.
The .sg extension belongs to Singapore and is managed by SGNIC.
The .sh extension belongs to Saint Helena and is managed by Internet Computer Bureau (Identity Digital).
.si is the official internet extension for Slovenia.
The .sk extension belongs to Slovakia and is managed by SK-NIC.
The .sl extension belongs to Sierra Leone and is managed by Sierratel.
.sn is the country code domain of Senegal.
.so is the official internet extension for Somalia.
.sr is the official internet extension for Suriname.
.st is the country code domain of São Tomé and Príncipe.
.su is the country code domain of Soviet Union (legacy).
.sx is the country code domain of Sint Maarten.