ostname(newest.html) - phpMan

BIO_ADDR_hostname_string (3ssl) - BIO_ADDR routines
BIO_get_conn_hostname (3ssl) - connect BIO
BIO_set_conn_hostname (3ssl) - connect BIO
freehostent (3)      - get network hostnames and addresses
geoiplookup (1)      - look up country using IP Address or hostname
geoiplookup6 (1)     - look up country using IP Address or hostname
gethostname (2)      - get/set hostname
gethostname (3p)     - get name of current host
getipnodebyaddr (3)  - get network hostnames and addresses
getipnodebyname (3)  - get network hostnames and addresses
hostname (1)         - show or set the system's host name
hostname (5)         - Local hostname configuration file
hostname (7)         - hostname resolution description
hostnamectl (1)      - Control the system hostname
hosts (5)            - static table lookup for hostnames
libnss_myhostname.so.2 (8) - Provide hostname resolution for the locally conf...
libnss_mymachines.so.2 (8) - Provide hostname resolution for local container ...
libnss_resolve.so.2 (8) - Provide hostname resolution via systemd-resolved.se...
logresolve (1)       - Resolve IP-addresses to hostnames in Apache log files
nss-myhostname (8)   - Provide hostname resolution for the locally configured...
nss-mymachines (8)   - Provide hostname resolution for local container instan...
nss-resolve (8)      - Provide hostname resolution via systemd-resolved.service
sethostname (2)      - get/set hostname
SSL_SESSION_get0_hostname (3ssl) - get and set SNI and ALPN data associated w...
SSL_SESSION_set1_hostname (3ssl) - get and set SNI and ALPN data associated w...
Sys::Hostname (3pm)  - Try every conceivable way to get hostname
systemd-hostnamed (8) - Host name bus mechanism
systemd-hostnamed.service (8) - Host name bus mechanism