add dynamic IP attributions

utils.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"math/big"
+	"net"
 	"sort"
 
 	"github.com/pyke369/golang-support/uconfig"
@@ -32,3 +34,14 @@ func parseConfigArray(config *uconfig.UConfig, configpath string) []string {
 	}
 	return result
 }
+
+func nextIP(ip net.IP) net.IP {
+	// Convert to big.Int and increment
+	ipb := big.NewInt(0).SetBytes([]byte(ip))
+	ipb.Add(ipb, big.NewInt(1))
+
+	// Add leading zeros
+	b := ipb.Bytes()
+	b = append(make([]byte, len(ip)-len(b)), b...)
+	return net.IP(b)
+}