Test which TCP ports are blocked by my ISP

scan_isp_blocklist.sh

#!/bin/bash

for port in {1..9999}; do
  echo -n "TCP $port: "
  result=$(nc "$1" "$port" -w 1 2>&1 < /dev/null)
  if [ "$?" -eq 0 ]; then
    echo "Open"
    continue
  fi
  if [[ "$result" == *refused* ]]; then
    echo "Closed"
  fi
  if [[ "$result" == *time* ]]; then
    echo "$port" >> block_list.txt
    echo "BLOCKED"
  fi
done

Should add -v on Ubuntu 20.04

diff --git a/scan_isp_blocklist.sh b/scan_isp_blocklist.sh
index c58ba4d..5d394be 100644
--- a/scan_isp_blocklist.sh
+++ b/scan_isp_blocklist.sh
@@ -2,7 +2,7 @@

 for port in {1..9999}; do
   echo -n "TCP $port: "
-  result=$(nc "$1" "$port" -w 1 2>&1 < /dev/null)
+  result=$(nc "$1" "$port" -w 1 -v 2>&1 < /dev/null)
   if [ "$?" -eq 0 ]; then
     echo "Open"
     continue

怎么调成看开放端口是哪些？

怎么调成看开放端口是哪些？

这你直接监听所有端口，然后端口扫描就行了，不过Advanced Port Scanner不准。

多谢脚本，mac系统可以稍微修改下： nc "$1" "$port" -v -G 1 -w 1 2>&1

大神，本人不才，现在也是遇到了有公网IP但是连接不上的问题，大概率是ISP封锁端口了，通过网上教程找到这里来，冒昧的问一句，这个脚本如何使用？

冒昧的问一句，这个脚本如何使用？