Limit frequent website visits

CREATE TABLE [dbo].[Zz_AccessIP](
    [IP] [nvarchar](50) NOT NULL,
    [FirstDateTime] [datetime] NOT NULL,
    [LastDateTime] [datetime] NOT NULL,
    [Times] [int] NOT NULL,
 CONSTRAINT [PK_Zz_AccessIP] PRIMARY KEY CLUSTERED 
(
    [IP] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
 
GO
 
ALTER TABLE [dbo].[Zz_AccessIP] ADD  CONSTRAINT [DF_Zz_AccessIP_FirstDateTime]  DEFAULT (getdate()) FOR [FirstDateTime]
GO
 
ALTER TABLE [dbo].[Zz_AccessIP] ADD  CONSTRAINT [DF_Zz_AccessIP_LastDateTime]  DEFAULT (getdate()) FOR [LastDateTime]
GO
 
ALTER TABLE [dbo].[Zz_AccessIP] ADD  CONSTRAINT [DF_Zz_AccessIP_Times]  DEFAULT ((0)) FOR [Times]
GO