.SH DESCRIPTION
These routines are used by Internet Protocol (IP) programs to
manipulate IP and Ethernet addresses.
-Plan 9, by default, uses V6 format IP addresses. Since V4
+Plan 9, by default, uses V6-format IP addresses. Since V4
addresses fit into the V6 space, all IP addresses can be represented.
IP addresses are stored as a string of 16
.B unsigned
.PP
.I Defmask
returns the standard class A, B, or C mask for
-.I ipaddr .
+.IR ipaddr .
.PP
.I Isv4
returns non-zero if the V6 address is in the V4 space, that is,