ostbyname(category13-admin-isp-software.html) - phpMan

gethostbyname (3)    - get network host entry
gethostbyname (3p)   - network host database functions
gethostbyname2 (3)   - get network host entry
gethostbyname2_r (3) - get network host entry
gethostbyname_r (3)  - get network host entry