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Man Pages
HF(1) FreeBSD General Commands Manual HF(1)

hf, ef, nf, pf - address to name filters

hf [-1abcdilN] [-f format] [-t secs] [file ...]
 
hf -x [file ...]
 
ef [-d] [file ...]
 
nf [-di] [file ...]
 
pf [-d] [file ...]

These filters reads the named files (or from stdin if there are none) and replace occurrences of a particular kind of address to the corresponding name:
hf - converts raw internet addresses to hostnames.
 
ef - converts ethernet addresses to hostnames.
 
nf - converts network addresses to names.
 
pf - converts square bracketed port numbers to names.

Options common to all programs:
-d
Dump the hash table (usually for debugging purposes).
Options specific to hf:
-1
Attempt to convert only the first address on a line.
-a
Use asynchronous dns lookups.
-b
Prints both the hostname and the ip address (the latter in parentheses). This is a shortcut for -f "%h(%i)".
-c
Checks the names against ip addresses; that is, the hostname the address resolves to must resolve back to the address or else the address is not converted to a hostname.
-f
Specify a format string containing escapes to be used to create the replacement text. The escapes are as follows:
%h - hostname (%D, %N, %l or even %i)
 
%D - local domain truncated hostname
 
%N - domain truncated hostname
 
%l - long hostname (FQDN)
 
%i - ip address
 
%% - %
Unrecognized escapes expand to the character without the percent. It's acceptable to use specific escapes more than once. Specifying an empty format resets it to the default ("%h").
-i
Force converted names to be all lowercase.
-l
By default, hf strips the domain part of hostnames in the local domain. The -l flag suppresses this stripping.
-N
Strips the entire domain of all hostnames.
-t
Specify a timeout (in seconds) for name and address lookups. By default, timeouts are left up to the resolver routines.
-x
Instead of replacing ip addresses with names, just output the raw ip addresses, one per line. No other flags are allowed (or would even make sense).
Options specific to nf:
-i
Force converted names to be all lowercase.
-b
Prints both the hostname and the ip address (the latter in parentheses).
-p
Pad network addresses to four octets.

gethostbyaddr(3), ether_aton(3), getnetbyaddr(3), getservbyport(3)

If a port number has different tcp and udp names, pf will favor the tcp name.
October, 20 2017 4th Berkeley Distribution

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