v0.2.0

ADDED:
* num-nets subcommand' this is MUCH much faster than actually splitting
  if you're trying to figure out how many times a given subnet fits into
  a network.

cmd/subnetter/main.go

@@ -33,6 +33,8 @@ func main() {
 	var remaining *netipx.IPSet
 	var buf *bytes.Buffer
 	var res *netsplit.StructuredResults
+	var numNets uint
+	var v6Only bool
 	var noStrict bool
 	var strictErr error
 	var reservations map[netip.Prefix]*netsplit.IANAAddrNetResRecord
@@ -79,6 +81,27 @@ func main() {
 			log.Panicln(err)
 		}
 		return
+	case "num-nets":
+		if numNets, v6Only, err = netsplit.NumNets(
+			args.NumNets.Sizes.SubnetSize,
+			args.NumNets.Sizes.NetworkSize,
+		); err != nil {
+			log.Panicln(err)
+		}
+		if !args.NumNets.Verbose {
+			fmt.Printf("%d\n", numNets)
+			if !args.NumNets.NoV6Check {
+				fmt.Println(v6Only)
+			}
+		} else {
+			fmt.Printf("Network Size:\t\t\t%d\n", args.NumNets.Sizes.NetworkSize)
+			fmt.Printf("Subnet Size:\t\t\t%d\n", args.NumNets.Sizes.SubnetSize)
+			fmt.Printf("Number of Subnets:\t\t%d\n", numNets)
+			if !args.NumNets.NoV6Check {
+				fmt.Printf("Subnetting is IPv6-Only:\t%v\n", v6Only)
+			}
+		}
+		return
 	case "reserved":
 		if origPfx, err = netip.ParsePrefix(args.Check.Network.Network); err != nil {
 			log.Panicln(err)
@@ -136,7 +159,12 @@ func main() {
 			origPfx = *resPfx
 		}
 		pfx = netipx.PrefixIPNet(origPfx.Masked())
-		cmnArgs = args.Parse.common
+		cmnArgs = common{
+			commonBase: args.Parse.commonBase,
+			Network: Net{
+				Network: res.Original.String(),
+			},
+		}
 		if err = printNets(&origPfx, pfx, nets, remaining, &cmnArgs, res.GetSplitter()); err != nil {
 			log.Panicln(err)
 		}
@@ -185,7 +213,7 @@ func main() {
 				PrefixLength: args.SplitCIDR.Prefix,
 				BaseSplitter: new(netsplit.BaseSplitter),
 			}
-		case "vlsm":
+		case "split-vlsm":
 			if err = validate.Struct(args.VLSM); err != nil {
 				log.Panicln(err)
 			}