my tiny scanner

[mr-unix]

hi whats up ??
before 2 days ago i was so board so i started to write a port scanner her it is :

#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
    
    int main(int argc, char *argv[])
    {
        int sockfd, port;
        struct hostent *host;
        
        printf("welcome to Fast-scanner 1.4 \n");
        
	if (argc != 2) {
            fprintf(stderr,"ip or hostname\n");
            exit(1);
        }

        if ((host=gethostbyname(argv[1])) == NULL) { 
            perror("gproblem finding victim :(");
            exit(1);
        }
	for(port=0; port<=65000; port++)
	{
	struct sockaddr_in host_addr; 
        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("problem in socket");
            exit(1);
        }

        host_addr.sin_family = AF_INET;   
        host_addr.sin_port = htons(port);  
        host_addr.sin_addr = *((struct in_addr *)host->h_addr);
        memset(&(host_addr.sin_zero), '\0', 8);  

        if (connect(sockfd, (struct sockaddr *)&host_addr, sizeof(struct sockaddr)) == -1) {
            //printf(".");
	    close(sockfd);
        }
	else { 
	printf("*****this port %i is open*****\n", port);
	close(sockfd);
	}
	}
        printf("for more info on port numbers :http://www.iana.org/assignments/port-numbers\n"); 	
	printf("Mr-Unix Tm [email protected] \n");
	}

tell me what you think about my scanner and what to improve
tnx