It blocks spam posts, login attempts and malicious access to the back-end requested from the specific countries, and also prevents zero-day exploit.

IP Geo Block

The more you install themes and plugins, the more likely your sites will be vulnerable, even if you <a href="https://codex.wordpress.org/Hardening_WordPress" title="Hardening WordPress &laquo; WordPress Codex" rel="nofollow ugc">securely harden your sites</a>.
While WordPress.org <a href="https://wordpress.org/about/security/" title="Security | WordPress.org" rel="ugc">provides</a> <a href="https://developer.wordpress.org/themes/theme-security/" title="Theme Security | Theme Developer Handbook | WordPress Developer Resources" rel="nofollow ugc">excellent</a> <a href="https://developer.wordpress.org/plugins/security/" title="Plugin Security | Plugin Developer Handbook | WordPress Developer Resources" rel="nofollow ugc">resources</a>, themes and plugins may often get vulnerable due to developers&#8217; <a href="https://www.google.com/search?q=human+factors+in+security" title="human factors in security - Google Search" rel="nofollow ugc">human factors</a> such as lack of security awareness, misuse and disuse of the best practices in those resources.
This plugin focuses on insights into such developers&#8217; human factors instead of detecting the specific attack vectors after they were disclosed. This brings a smart and powerful methods named as &#8220;WP Zero-day Exploit Prevention&#8221; and &#8220;WP Metadata Exploit Protection&#8220;.
Combined with those methods and IP address geolocation, you&#8217;ll be surprised to find a bunch of malicious or undesirable access blocked in the logs of this plugin after several days of installation.
<h4>Features</h4>
<ul>
<li>
Privacy by design: 
IP address is always encrypted on recording in logs/cache. Moreover, it can be anonymized and restricted on sending to the 3rd parties such as geolocation APIs or whois service.
</li>
<li>
Immigration control: 
Access to the basic and important entrances into back-end such as <code>wp-comments-post.php</code>, <code>xmlrpc.php</code>, <code>wp-login.php</code>, <code>wp-signup.php</code>, <code>wp-admin/admin.php</code>, <code>wp-admin/admin-ajax.php</code>, <code>wp-admin/admin-post.php</code> will be validated by means of a country code based on IP address. It allows you to configure either whitelist or blacklist to <a href="https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Officially_assigned_code_elements" title="ISO 3166-1 alpha-2 - Wikipedia" rel="nofollow ugc">specify the countires</a>, <a href="https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing" title="Classless Inter-Domain Routing - Wikipedia" rel="nofollow ugc">CIDR notation</a> for a range of IP addresses and <a href="https://en.wikipedia.org/wiki/Autonomous_system_(Internet)" title="Autonomous system (Internet) - Wikipedia" rel="nofollow ugc">AS number</a> for a group of IP networks.
</li>
<li>
Zero-day Exploit Prevention: 
Unlike other security firewalls based on attack patterns (vectors), the original feature &#8220;WordPress Zero-day Exploit Prevention&#8221; (WP-ZEP) is focused on patterns of vulnerability. It is simple but still smart and strong enough to block any malicious accesses to <code>wp-admin/*.php</code>, <code>plugins/*.php</code> and <code>themes/*.php</code> even from the permitted countries. It will protect your site against certain types of attack such as CSRF, LFI, SQLi, XSS and so on, even if you have some vulnerable plugins and themes in your site.
</li>
<li>
Guard against login attempts: 
In order to prevent hacking through the login form and XML-RPC by brute-force and the reverse-brute-force attacks, the number of login attempts will be limited per IP address even from the permitted countries.
</li>
<li>
Minimize server load against brute-force attacks: 
You can configure this plugin as a <a href="https://codex.wordpress.org/Must_Use_Plugins" title="Must Use Plugins &laquo; WordPress Codex" rel="nofollow ugc">Must Use Plugins</a> so that this plugin can be loaded prior to regular plugins. It can massively <a href="https://www.ipgeoblock.com/codex/validation-timing.html" title="Validation timing | IP Geo Block" rel="nofollow ugc">reduce the load on server</a>.
</li>
<li>
Prevent malicious down/uploading: 
A malicious request such as exposing <code>wp-config.php</code> or uploading malwares via vulnerable plugins/themes can be blocked.
</li>
<li>
Block badly-behaved bots and crawlers: 
A simple logic may help to reduce the number of rogue bots and crawlers scraping your site.
</li>
<li>
Support of BuddyPress and bbPress: 
You can configure this plugin so that a registered user can login as a membership from anywhere, while a request such as a new user registration, lost password, creating a new topic and subscribing comment can be blocked by country. It is suitable for <a href="https://wordpress.org/plugins/buddypress/" title="BuddyPress &mdash; WordPress Plugins" rel="ugc">BuddyPress</a> and <a href="https://wordpress.org/plugins/bbpress/" title="WordPress &rsaquo; bbPress &laquo; WordPress Plugins" rel="ugc">bbPress</a> to help reducing spams.
</li>
<li>
Referrer suppressor for external links: 
When you click an external hyperlink on admin screens, http referrer will be eliminated to hide a footprint of your site.
</li>
<li>
Multiple source of IP Geolocation databases: 
<a href="https://www.maxmind.com" title="MaxMind - IP Geolocation and Online Fraud Prevention" rel="nofollow ugc">MaxMind GeoLite2 free databases</a> (it requires PHP 5.4.0+) and <a href="https://www.ip2location.com/" title="IP Address Geolocation to Identify Website Visitor's Geographical Location" rel="nofollow ugc">IP2Location LITE databases</a> can be installed in this plugin. Also free Geolocation REST APIs and whois information can be available for audit purposes. 
Father more, <a href="https://www.ipgeoblock.com/article/api-class-library.html" title="CloudFlare &amp; CloudFront API class library | IP Geo Block" rel="nofollow ugc">dedicated API class libraries</a> can be installed for CloudFlare and CloudFront as a reverse proxy service.
</li>
<li>
Customizing response: 
HTTP response code can be selectable as <code>403 Forbidden</code> to deny access pages, <code>404 Not Found</code> to hide pages or even <code>200 OK</code> to redirect to the top page. 
You can also have a human friendly page (like <code>404.php</code>) in your parent/child theme template directory to fit your site design.
</li>
<li>
Validation logs: 
Validation logs for useful information to audit attack patterns can be manageable.
</li>
<li>
Cooperation with full spec security plugin: 
This plugin is lite enough to be able to cooperate with other full spec security plugin such as <a href="https://wordpress.org/plugins/wordfence/" title="Wordfence Security &mdash; WordPress Plugins" rel="ugc">Wordfence Security</a>. See <a href="https://www.ipgeoblock.com/codex/page-speed-performance.html" title="Page speed performance | IP Geo Block" rel="nofollow ugc">this report</a> about page speed performance.
</li>
<li>
Extendability: 
You can customize the behavior of this plugin via <code>add_filter()</code> with <a href="https://www.ipgeoblock.com/codex/" title="Codex | IP Geo Block" rel="nofollow ugc">pre-defined filter hook</a>. See various use cases in <a href="https://github.com/tokkonopapa/WordPress-IP-Geo-Block/blob/master/ip-geo-block/samples.php" title="WordPress-IP-Geo-Block/samples.php at master - tokkonopapa/WordPress-IP-Geo-Block - GitHub" rel="nofollow ugc">samples.php</a> bundled within this package. 
You can also get the extension <a href="https://github.com/ddur/WordPress-IP-Geo-Allow" title="GitHub - ddur/WordPress-IP-Geo-Allow: WordPress Plugin Exension for WordPress-IP-Geo-Block Plugin" rel="nofollow ugc">IP Geo Allow</a> by <a href="https://github.com/ddur" title="ddur (Dragan) - GitHub" rel="nofollow ugc">Dragan</a>. It makes admin screens strictly private with more flexible way than specifying IP addresses.
</li>
<li>
Self blocking prevention and easy rescue: 
Website owners do not prefer themselves to be blocked. This plugin prevents such a sad thing unless you force it. And futhermore, if such a situation occurs, you can <a href="https://www.ipgeoblock.com/codex/what-should-i-do-when-i-m-locked-out.html" title="What should I do when I'm locked out? | IP Geo Block" rel="nofollow ugc">rescue yourself</a> easily.
</li>
<li>
Clean uninstallation: 
Nothing is left in your precious mySQL database after uninstallation. So you can feel free to install and activate to make a trial of this plugin&#8217;s functionality.
</li>
</ul>
<h4>Attribution</h4>
This package includes GeoLite2 library distributed by MaxMind, available from <a href="https://www.maxmind.com" title="MaxMind - IP Geolocation and Online Fraud Prevention" rel="nofollow ugc">MaxMind</a> (it requires PHP 5.4.0+), and also includes IP2Location open source libraries available from <a href="https://www.ip2location.com" title="IP Address Geolocation to Identify Website Visitor's Geographical Location" rel="nofollow ugc">IP2Location</a>.
Also thanks for providing the following great services and REST APIs for free.
<ul>
<li><a href="http://ip-api.com/" title="IP-API.com - Free Geolocation API" rel="nofollow ugc">http://ip-api.com/</a> (IPv4, IPv6 / free for non-commercial use)</li>
<li><a href="http://geoiplookup.net/" title="What Is My IP Address | GeoIP Lookup" rel="nofollow ugc">http://geoiplookup.net/</a> (IPv4, IPv6 / free)</li>
<li><a href="https://ipinfo.io/" title="IP Address API and Data Solutions" rel="nofollow ugc">https://ipinfo.io/</a> (IPv4, IPv6 / free)</li>
<li>[https://ipapi.com/](https://ipapi.com/ &#8220;ipapi &#8211; IP Address Lookup and Geolocation API) (IPv4, IPv6 / free, need API key)</li>
<li><a href="https://ipdata.co/" title="ipdata.co - IP Geolocation and Threat Data API" rel="nofollow ugc">https://ipdata.co/</a> (IPv4, IPv6 / free, need API key)</li>
<li><a href="https://ipstack.com/" title="ipstack - Free IP Geolocation API" rel="nofollow ugc">https://ipstack.com/</a> (IPv4, IPv6 / free for registered user, need API key)</li>
<li><a href="https://ipinfodb.com/" title="Free IP Geolocation Tools and API| IPInfoDB" rel="nofollow ugc">https://ipinfodb.com/</a> (IPv4, IPv6 / free for registered user, need API key)</li>
</ul>
<h4>Development</h4>
Development of this plugin is promoted at <a href="https://github.com/tokkonopapa/WordPress-IP-Geo-Block" title="tokkonopapa/WordPress-IP-Geo-Block - GitHub" rel="nofollow ugc">WordPress-IP-Geo-Block</a> and class libraries to handle geo-location database are developed separately as &#8220;add-in&#8221;s at <a href="https://github.com/tokkonopapa/WordPress-IP-Geo-API" title="tokkonopapa/WordPress-IP-Geo-API - GitHub" rel="nofollow ugc">WordPress-IP-Geo-API</a>.
All contributions will always be welcome. Or visit my <a href="https://www.ipgeoblock.com/" title="IP Geo Block" rel="nofollow ugc">development blog</a>.
<h4>Known issues</h4>
<ul>
<li>No image is shown after drag &amp; drop a image in grid view at &#8220;Media Library&#8221;. For more details, please refer to <a href="https://github.com/tokkonopapa/WordPress-IP-Geo-Block/issues/2" title="No image is shown after drag &amp; drop a image in grid view at &quot;Media Library&quot;. - Issue #2 - tokkonopapa/WordPress-IP-Geo-Block - GitHub" rel="nofollow ugc">this ticket at Github</a>.</li>
<li>From <a href="https://make.wordpress.org/core/2016/03/09/comment-changes-in-wordpress-4-5/" title="Comment Changes in WordPress 4.5 &#8211; Make WordPress Core" rel="nofollow ugc">WordPress 4.5</a>, <code>rel=nofollow</code> had no longer be attached to the links in <code>comment_content</code>. This change prevents to block &#8220;<a href="https://www.owasp.org/index.php/Server_Side_Request_Forgery" title="Server Side Request Forgery - OWASP" rel="nofollow ugc">Server Side Request Forgeries</a>&#8221; (not Cross Site but a malicious internal link in the comment field).</li>
<li><a href="https://apps.wordpress.com/mobile/" title="WordPress.com Apps - Mobile Apps" rel="nofollow ugc">WordPress.com Mobile App</a> can&#8217;t execute image uploading because of its own authentication system via XMLRPC.</li>
</ul>

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