diff --git a/hakrawler.go b/hakrawler.go
index 1da86ed..1630997 100644
--- a/hakrawler.go
+++ b/hakrawler.go
@@ -45,6 +45,7 @@ func main() {
 	proxy := flag.String(("proxy"), "", "Proxy URL. E.g. -proxy http://127.0.0.1:8080")
 	timeout := flag.Int("timeout", -1, "Maximum time to crawl each URL from stdin, in seconds.")
 	disableRedirects := flag.Bool("dr", false, "Disable following HTTP redirects.")
+	matchApex := flag.Bool("match-apex", false, "Match domain apex.")
 
 	flag.Parse()
 
@@ -79,6 +80,17 @@ func main() {
 				continue
 			}
 
+			apexDomain, err := getApexDomain(hostname)
+			if err != nil {
+				log.Println("Error getting apex domain:", err)
+				continue
+			}
+
+			match := apexDomain
+			if !*matchApex {
+				match = ""
+			}
+
 			allowed_domains := []string{hostname}
 			// if "Host" header is set, append it to allowed domains
 			if headers != nil {
@@ -92,7 +104,7 @@ func main() {
 				// default user agent header
 				colly.UserAgent("Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0"),
 				// set custom headers
-				colly.Headers(headers),
+				colly.Headers(headers)
 				// limit crawling to the domain of the specified URL
 				colly.AllowedDomains(allowed_domains...),
 				// set MaxDepth to the specified depth
@@ -127,19 +139,19 @@ func main() {
 				abs_link := e.Request.AbsoluteURL(link)
 				if strings.Contains(abs_link, url) || !*inside {
 
-					printResult(link, "href", *showSource, *showWhere, *showJson, results, e)
+					printResult(link, "href", *showSource, *showWhere, *showJson, results, e, match)
 					e.Request.Visit(link)
 				}
 			})
 
 			// find and print all the JavaScript files
 			c.OnHTML("script[src]", func(e *colly.HTMLElement) {
-				printResult(e.Attr("src"), "script", *showSource, *showWhere, *showJson, results, e)
+				printResult(e.Attr("src"), "script", *showSource, *showWhere, *showJson, results, e, match)
 			})
 
 			// find and print all the form action URLs
 			c.OnHTML("form[action]", func(e *colly.HTMLElement) {
-				printResult(e.Attr("action"), "form", *showSource, *showWhere, *showJson, results, e)
+				printResult(e.Attr("action"), "form", *showSource, *showWhere, *showJson, results, e, match)
 			})
 
 			// add the custom headers
@@ -248,10 +260,19 @@ func extractHostname(urlString string) (string, error) {
 }
 
 // print result constructs output lines and sends them to the results chan
-func printResult(link string, sourceName string, showSource bool, showWhere bool, showJson bool, results chan string, e *colly.HTMLElement) {
+func printResult(link string, sourceName string, showSource bool, showWhere bool, showJson bool, results chan string, e *colly.HTMLElement, match string) {
 	result := e.Request.AbsoluteURL(link)
 	whereURL := e.Request.URL.String()
 	if result != "" {
+		parsedUrl, err := url.Parse(result)
+		if err != nil {
+			log.Println("Error parsing URL:", err)
+			return
+		}
+		if match != "" && !strings.HasSuffix(parsedUrl.Hostname(), match) {
+			return
+		}
+
 		if showJson {
 			where := ""
 			if showWhere {
@@ -290,3 +311,13 @@ func isUnique(url string) bool {
 	sm.Store(url, true)
 	return true
 }
+
+// getApexDomain returns the apex domain of a hostname
+func getApexDomain(hostname string) (string, error) {
+	parts := strings.Split(hostname, ".")
+	if len(parts) < 2 {
+		return "", errors.New("Invalid hostname")
+	}
+
+	return parts[len(parts)-2] + "." + parts[len(parts)-1], nil
+}