IP address translation address segment

Recent work needs , Wrote a small script for address conversion , Easy to find the corresponding IP Home address segment , It has a certain auxiliary effect on the operation and maintenance personnel

Some places in the middle can be simplified , But I'm too lazy to change …

as follows ：

# coding:utf-8

def transition_to_sub26(file):
    with open(file, 'r', encoding='utf-8') as file:
        for ip in file:
            ip_end = ip.split(".")[3]
            ip_end = int(ip_end)

            def sub_net(ip_end):

                if ip_end < 64:
                    return "0/26"
                elif ip_end < 128:
                    return "64/26"
                elif ip_end < 192:
                    return "128/26"
                else:
                    return "192/26"

            res = sub_net(ip_end)
            # print(res)

            ip_join = ".".join(ip.split(".")[0:3])
            # print(ip_join) #10.41.0
            ip_sub = ip_join + "." + res
            # return ip_sub
            print(ip_sub)  # 10.41.0.64/26
            with open("IP Address translation results (26 position ).txt", 'a+', encoding='utf-8') as file1:
                file1.write(ip_sub + "\n")


def transition_to_sub28(file):
    with open(file, 'r', encoding='utf-8') as file:
        for ip in file:
            ip_end = ip.split(".")[3]
            ip_end = int(ip_end)

            def sub_net(ip_end):

                if ip_end < 16:
                    return "0/28"
                elif ip_end < 32:
                    return "16/28"
                elif ip_end < 48:
                    return "32/28"
                elif ip_end < 64:
                    return "48/28"
                elif ip_end < 80:
                    return "64/28"
                elif ip_end < 96:
                    return "80/28"
                elif ip_end < 112:
                    return "96/28"
                elif ip_end < 128:
                    return "112/28"
                elif ip_end < 144:
                    return "128/28"
                elif ip_end < 160:
                    return "144/28"
                elif ip_end < 176:
                    return "160/28"
                elif ip_end < 192:
                    return "176/28"
                elif ip_end < 208:
                    return "192/28"
                elif ip_end < 224:
                    return "208/28"
                elif ip_end < 240:
                    return "224/28"
                else:
                    return "240/28"

            res = sub_net(ip_end)
            # print(res)

            ip_join = ".".join(ip.split(".")[0:3])
            # print(ip_join) #10.41.0
            ip_sub = ip_join + "." + res
            print(ip_sub)  # 10.41.0.64/26
            with open("IP Address translation results (28 position ).txt", 'a+', encoding='utf-8') as file2:
                file2.write(ip_sub + "\n")


if __name__ == '__main__':
    file = input(" Please enter IP Address file path :" + "\n")
    input_result = input(" Please enter the address segment to be converted ,【1】 Means to convert into 26 position ,【2】 Means to convert into 28 position ：" + "\n")
    if input_result == "1":
        transition_to_sub26(file)
    if input_result == "2":
        transition_to_sub28(file)