using System;
  using System.Collections.Generic;
  using System.Text;
  using System.Net;
  namespace IPUtility
  {
  class Program
  {
  static void Main(string[] args)
  {
  IPRangeManage irm = new IPRangeManage();
  irm.Add(new IPRange("石家庄", "219.148.24.0", "219.148.63.255"));
  irm.Add(new IPRange("石家庄", "222.222.0.0", "222.222.63.255"));
  irm.Add(new IPRange("唐山", "219.148.64.0", "219.148.79.255"));
  irm.Add(new IPRange("保定", "219.148.20.0", "219.148.23.255"));
  Console.WriteLine(irm.Search("219.148.56.3").Name);
  Console.ReadLine();
  }
  }
  public class IPRange
  {
  private string _Name = string.Empty;
  private ulong _BeginIP = 0;
  private ulong _EndIP = Int32.MaxValue;
  /**//// 
  /// IP段名称
  /// 
  public string Name
  {
  get { return _Name; }
  set { _Name = value; }
  }
  /**//// 
  /// ?始IP
  /// 
  public ulong BeginIP
  {
  get { return _BeginIP; }
  set { _BeginIP = value; }
  }
  /**//// 
  /// ?束IP
  /// 
  public ulong EndIP
  {
  get { return _EndIP; }
  set { _EndIP = value; }
  }
  /**//// 
  /// 此IP段的范?
  /// 
  public ulong Range
  {
  get
  {
  return EndIP - BeginIP;
  }
  }
  public IPRange(string name, string ipBegin, string ipEnd)
  {
  this.Name = name;
  this.BeginIP = IP2A(ipBegin);
  this.EndIP = IP2A(ipEnd);
  }
  public static ulong IP2A(string ip)
  {
  byte[] bytes = IPAddress.Parse(ip).GetAddressBytes();
  ulong ret = 0;
  foreach (byte b in bytes)
  {
  ret <<= 8;
  ret |= b;
  }
  return ret;
  }
  public static int Compare(IPRange x, IPRange y)
  {
  if(x.Range == y.Range)
  return 0;
  else if(x.Range > y.Range)
  return 1;
  else return -1;
  }
  }
  public class IPRangeManage
  {
  public IPRangeManage()
  { }
  private List< IPRange> _IPRangeList = new List< IPRange>();
  private bool _NeedSort = true;
  public void Add(IPRange ipRange)
  {
  _IPRangeList.Add(ipRange);
  _NeedSort = true;
  }
  private void Sort()
  {
  if (_NeedSort)
  {
  _IPRangeList.Sort(new Comparison(IPRange.Compare));
  }
  }
  public IPRange Search(string ipString)
  {
  ulong ip = IPRange.IP2A(ipString);
  this.Sort();
  foreach (IPRange ir in _IPRangeList)
  {
  if (ir.BeginIP <= ip && ir.EndIP >= ip)
  {
  return ir;
  }
  }
  return null;
  }
  }
  }

 

FROM:http://sangai.iteye.com/blog/566363

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