Port Authority - LAN Host Discovery & Port Scanner

A handy systems and security-focused tool, Port Authority is a very fast port scanner. Port Authority also allows you to quickly discover hosts on your network and will display useful network information about your device and other hosts.

One of the fastest port scanners with host discovery on the market! Host discovery is typically performed in less than 5 seconds. If the device you're scanning drops packets, it takes about 10 seconds to scan 1000 ports. If the device you're scanning rejects packets, it takes less than 30 seconds to scan all 65,535 ports!

Features

* Heavily threaded, no more waiting for results one at a time

* LAN host discovery

* Public IP discovery

* MAC address vendor detection

* LAN/WAN host TCP port scanning

* Custom port range scans

* Open discovered HTTP(S) services to browser

* Lightweight service fingerprinting (SSH/HTTP(S) server type and version)

* DNS record lookups supporting almost every record type

* Wake-on-LAN for LAN hosts

How are scans so fast?

This application makes heavy use of threading. Because most of the operations performed are I/O bound a lot more threads can be used than the number of cores on a device. In fact, one of the most intensive parts of the application is updating the UI during scans. This has gone through many optimizations but still remains a bit of a hotspot.

I have a lower end and/or older device, will this work?

Absolutely! Just lower the number of threads that are used for port scans in the settings. I'm always working on improving the efficiency and memory footprint of the application, and things have been greatly improved since the original version!

I keep getting crashes when scanning a large range of ports

The crash is most likely an out of memory exception that is occurring due to using too many threads. Lower your port scan thread count in the settings. The right value will be highly dependent on the device and its hardware.

I'm getting a warning that says this application is trying to send email

A few users have reported that a warning pops up on their device, warning them that this application is trying to send mail. This is caused by various security software so you can be assured (or just look at the code yourself) that I'm not sending mail.

Some security software looks at where traffic is coming and going from the device and takes certain actions for certain cases. If you're running any kind of port scan that includes port 25 (SMTP) this will most likely be flagged. Even though no data is being sent to that port the security software will see an outbound connection to an SMTP service and throw up a warning. Obviously this is a very bad check but some security tools are better than others and may actually look for data flowing out to port 25 to see if there's really anything happening.

I'm not finding some of the hosts/devices on my LAN

If you're finding that some devices aren't responding in time you should increase the host scan timeout setting, just be aware that it will cause host scans to take longer. In some cases it may be worth trading time for accuracy.

I'm not finding open ports that I know are truly open

You can now adjust the timeout for connections made to ports when performing either LAN or WAN scans. If you're scanning something over WAN (mobile network if you're using a cell phone) please be aware that scanning is best effort. Mobile carriers may detect that a real port scan is occurring and apply traffic shaping dynamically, or they may just start terminating the connections entirely. Additionally, if you happen to have poor signal or to not have 4G the quality of the network connection may be so poor that you'll need to have a fairly high timeout in order to tolerate latency spikes.

Do you like the application? Consider purchasing the donate version https://play.google.com/store/apps/details?id=com.aaronjwood.portauthority.donate

This software is 100% free and open source https://github.com/aaronjwood/PortAuthority

一个方便的系统和安全为重点的工具，港务局是一个非常快的端口扫描程序。港务局还允许您快速发现网络上的主机，并显示您的设备和其他主机是非常有用的网络信息。

其中最快的端口扫描器与市场上的主机发现的！主机发现在小于5秒下进行。如果你要扫描的设备丢弃数据包，它需要大约10秒扫描千口。如果你要扫描的设备将拒绝数据包，它只需不到30秒的扫描所有65,535口！

特征

*高度线程，没有更多的时间等待一个结果

*局域网主机发现

*公共IP发现

* MAC地址厂商检测

* LAN / WAN的主机的TCP端口扫描

*自定义端口范围扫描

*打开到浏览器发现的HTTP（S）服务

*轻量级服务指纹（SSH / HTTP（S）服务器类型和版本）

* DNS记录查找支持几乎所有的记录类型

*网络唤醒局域网主机

如何扫描如此之快？

此应用程序使用了大量的线程的。因为大多数所执行的操作的是I / O绑定更大量线程可以比芯的设备上的数量来使用。事实上，应用最密集的地区之一正在更新扫描过程中的UI。这已经经历了许多的优化走了，但仍然是一个有点热点。

我有一个低端和/或旧的设备，将这项工作？

绝对！只是降低被用于设置端口扫描的线程数。我一直在努力提高应用程序的效率和内存占用，事情已经从最初的版本有了很大的提高！

扫描大范围的端口时，我不断收到崩溃

崩溃是最有可能的内存溢出异常所发生由于使用过多的线程。降低设置你的端口扫描的线程数。正确的价值将很大程度上取决于设备及其硬件上。

我收到说，这个应用程序试图发送电子邮件警告

一些用户报告说，一个警告弹出他们的设备上，警告他们，这应用程序试图发送邮件。这是通过各种安全软件引起的，所以你可以放心（或者只是看你自己的代码），我不是发送邮件。

某些安全软件着眼于在交通即将到来，从设备会，并采取了某些情况下，某些动作。如果你运行任何端口扫描，包括25端口（SMTP），这将最有可能被标记。即使没有数据被发送到该端口的安全软件会看到一个SMTP服务的出站连接，并抛出了一个警告。显然，这是一个非常不好的检查，但一些安全工具是比别人更好，实际上可能会寻求数据流出到25端口看看有没有真的什么发生。

我没有找到某些主机的/我的LAN上的设备

如果你发现一些设备不能及时响应，你应该增加主机扫描超时设置，要知道，这将导致主机扫描，需要更长的时间。在某些情况下，它可能是值得的交易时间的准确性。

我没有找到开放的端口，我知道是真正开放

现在，您可以调整进行局域网或广域网扫描时端口建立的连接超时。如果你（如果你使用手机的移动网络）扫描了WAN的东西，请注意，扫描最大的努力。移动运营商可以检测到真正的端口扫描正在发生和应用流量整形动态，或者他们可能只是开始完全终止连接。此外，如果你碰巧有信号不好或没有4G网络连接的质量可能非常差，你需要有一个相当高的暂停时以容忍延迟高峰。

你喜欢的应用程序？考虑购买捐赠的版本https://play.google.com/store/apps/details?id=com.aaronjwood.portauthority.donate

这个软件是100％免费，开源https://github.com/aaronjwood/PortAuthority