H

.hk
The Internet country code top-level domain (ccTLD) for Hong Kong (Xianggang)

.hm
The Internet country code top-level domain (ccTLD) for Heard and Mc Donald Islands

.hn
The Internet country code top-level domain (ccTLD) for Honduras

.hr
The Internet country code top-level domain (ccTLD) for Croatia (Hrvatska)

.ht
The Internet country code top-level domain (ccTLD) for Haiti (Haïti)

.hu
The Internet country code top-level domain (ccTLD) for Hungary (Magyarország)

.hu
The Internet country code top-level domain (ccTLD) for Hungary (Magyarország)

HTTP (HyperText Transfer Protocol)
The set of rules for transferring hypertext documents on the Internet.