v0.2.5

ADDED:
* num-addrs subcommand, to get the number of hosts/addresses in a given
  prefix length
* get-net subcommand, to more easily get a single subnet from either the
  beginning or the end of a prefix. (MUCH FASTER than CIDR-splitting!)

netsplit/funcs_cidrsplitter.go

@@ -22,6 +22,10 @@ func (c *CIDRSplitter) Split() (nets []*netip.Prefix, remaining *netipx.IPSet, e
 		return
 	}
 
+	if err = validate.Struct(c); err != nil {
+		return
+	}
+
 	if base, ok = netipx.FromStdIPNet(c.network); !ok {
 		err = ErrBadBoundary
 		return
@@ -41,6 +45,15 @@ func (c *CIDRSplitter) Split() (nets []*netip.Prefix, remaining *netipx.IPSet, e
 		return
 	}
 
+	/*
+		TODO: This is *super* slow for tiny subnets in a large net.
+				For future optimzation, first off benchmark to make sure it makes a difference, but
+				chunk out the network (how to find appropriate length?) of n < x < y, where n is the network pfx len,
+				and goroutine each split into a channel.
+				Because this splits *on CIDR boundaries* and we aren't VLSM-ing, remaining never has to be considered-
+				it'll always be clean splitting.
+				See CIDRSplitter.LenSwitch.
+	*/
 	for {
 		if sub, remaining, ok = remaining.RemoveFreePrefix(c.PrefixLength); !ok {
 			if !sub.IsValid() {