diff --git a/internal/capture/capturer.go b/internal/capture/capturer.go
index d128dbd..10accb1 100644
--- a/internal/capture/capturer.go
+++ b/internal/capture/capturer.go
@@ -55,7 +55,8 @@ func (c *Capturer) Start(iface string, port int) error {
 	// -l: line buffered for real-time output
 	// -A: print packet payload in ASCII
 	// -s 0: capture full packets
-	cmd := fmt.Sprintf("sudo tcpdump -l -A -s 0 -i %s port %d 2>/dev/null", iface, port)
+	// -nn: don't resolve hostnames or port names
+	cmd := fmt.Sprintf("sudo tcpdump -l -nn -A -s 0 -i %s port %d 2>/dev/null", iface, port)
 
 	stdout, stderr, cleanup, err := c.sshClient.StartCommand(cmd)
 	if err != nil {
diff --git a/internal/capture/local.go b/internal/capture/local.go
index ba5ec6d..da8a56c 100644
--- a/internal/capture/local.go
+++ b/internal/capture/local.go
@@ -46,7 +46,8 @@ func (c *LocalCapturer) Start(iface string, port int) error {
 	// -l: line buffered
 	// -A: print packet payload in ASCII
 	// -s 0: capture full packets
-	args := []string{"-l", "-A", "-s", "0", "-i", iface, "port", fmt.Sprintf("%d", port)}
+	// -nn: don't resolve hostnames or port names
+	args := []string{"-l", "-nn", "-A", "-s", "0", "-i", iface, "port", fmt.Sprintf("%d", port)}
 	c.cmd = exec.CommandContext(ctx, "tcpdump", args...)
 
 	stdout, err := c.cmd.StdoutPipe()