写一个具体的c语言程序用来查询IP地址范围

以下是一个用来查询IP地址范围的简单 C 程序：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netdb.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s hostname\n", argv[0]);
        return 1;
    }

    struct addrinfo hints, *res;
    int errcode;
    char addrstr[100];
    void *ptr;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = PF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags |= AI_CANONNAME;

    errcode = getaddrinfo(argv[1], NULL, &hints, &res);
    if (errcode != 0) {
        printf("getaddrinfo: %s\n", gai_strerror(errcode));
        return 1;
    }

    printf("IP addresses for %s:\n\n", argv[1]);

    for (struct addrinfo *p = res; p != NULL; p = p->ai_next) {
        inet_ntop(p->ai_family, p->ai_addr->sa_data, addrstr, sizeof(addrstr));

        switch (p->ai_family) {
            case AF_INET:
                ptr = &((struct sockaddr_in *) p->ai_addr)->sin_addr;
                break;
            case AF_INET6:
                ptr = &((struct sockaddr_in6 *) p->ai_addr)->sin6_addr;
                break;
            default:
                printf("unknown address family\n");
                continue;
        }
        printf("%s\n", addrstr);
    }

    freeaddrinfo(res);
    return 0;
}

使用方法: 编译后在命令行中运行 ./program_name example.com

程序将会输出该域名的 IP 地址范围。