Ping the given host.
.TP 12
.I A.B.C.D
-Ping the given IP address.
+Ping the given IPv4 address.
.TP 12
.B subnet
-Ping the local class C subnet (the nearest 255 addresses).
+Ping the local subnet. On systems where we can determine the local
+network mask, we use that; otherwise, we assume Class C (254 hosts).
.TP 12
.B subnet/\fINN\fP
Ping a different-sized local subnet: e.g., \fBsubnet/28\fP would ping
-a 4-bit subnet (the nearest 15 addresses).
+a 4-bit subnet (the nearest 14 addresses). On systems where we can
+determine the local network mask, we always use that.
.TP 12
.I A.B.C.D/NN
-Ping an arbitrary other subnet. The IP address specifies the base address,
-and the part after the slash is how wide the subnet is. Typical values
-are /24 (for 255 addresses) and /28 (for 15 addresses).
+Ping an arbitrary other IPv4 subnet. The address specifies
+the base address, and the part after the slash is how wide the
+subnet is. Typical values are /24 (for 254 addresses) and /28 (for
+14 addresses).
.TP 12
.I filename
Ping the hosts listed in the given file. This file can be in the
seconds to respond, they won't show up; and if you are pinging several
hosts with very fast response times, they will all appear close to the
center of the screen (making their names hard to read.)
+.SH BUGS
+Does not support IPv6.
.SH SEE ALSO
.BR X (1),
.BR xscreensaver (1),
-.BR ping (8)
+.BR ping (8),
+.BR ping6 (8)
.SH COPYRIGHT
-Copyright \(co 2000-2008 by Jamie Zawinski <jwz@jwz.org>
+Copyright \(co 2000-2012 by Jamie Zawinski <jwz@jwz.org>
.RE
Copyright \(co 1998 by Stephen Martin. <smartin@canada.com>