tRPAdminPrefixListBeginLength 1.3.6.1.4.1.6527.3.1.2.17.2.2.4.1.8

When tRPAdminPrefixListType set to range(4), the mask length to use as the lower limit for the mask range. Must be larger than tRPAdminPrefixListMask and less than tRPAdminPrefixListThroughLength.