Nikki Blight

QR Redirector lets you set up your own QR Code redirection site. The plugin creates a new custom post type called QR Redirect, which generates a QR code that points to the post’s permalink. You may then specify any URL you like for the post to redirect to. Useful if you have an offsite contest, form, newsletter sign-up, etc. You can even change the URL you’re redirecting to without having to worry about updating the QR code in your advertising media.
This allows you to continuously reuse your QR codes on printed or linked marketing material… you can change the destination you’re sending your users to without ever having to change the artwork you’re using to promote it.
This plugin uses the Endroid QR-Code PHP library.

QR Redirector

QR Redirector lets you create a QR code for a URL on your site, and redirect that URL anywhere.  The result is a reusable QR Code.

IP2Location

This plugin will NOT work if any cache plugin is enabled.
This plugin enables user to block unwanted traffic from accessing your frontend (blog pages) or backend (admin area) by countries or proxy servers. It helps to reduce spam and unwanted sign ups easily by preventing unwanted visitors from browsing a particular page or entire website.
Key Features
<ul>
<li>Allow you to block the access from multiple countries.</li>
<li>Allow you to block the access by country grouping, such as EU, APAC, and so on.</li>
<li>Allow you to block the access from anonymous proxies.</li>
<li>Allow you to block the access by IP ranges.</li>
<li>Allow you to whitelist the crawler, for example, Google, Bing, Yandex, and so on, to index your pages (SEO friendly).</li>
<li>Supports IPv4 and IPv6</li>
<li>Default to 403 error (Permission Denied) display</li>
<li>Allow you to customize your own 403 page.</li>
<li>Send you an email notification if some one is trying to access your admin area.</li>
<li>Provide you statistical report of traffics blocked.</li>
</ul>
This plugin supports both IP2Location BIN data and web service for IP geolocation lookup. If you would like to use the IP2Location geolocation BIN data, you can easily download and update the BIN data via the plugin settings page. Alternatively, you can also download and update the BIN data file manually using the below links:
IP Geolocation file download: 
<a href="https://lite.ip2location.com" title="IP2Location LITE database" rel="nofollow ugc">IP2Location & IP2Proxy LITE database (Free)</a> 
<a href="https://ip2location.com" title="IP2Location commercial database" rel="nofollow ugc">IP2Location & IP2Proxy Commercial database (Comprehensive)</a>
To use the IP2Location IP geolocation web service (REST API) for geolocation, you’ll need to register an account at <a href="https://www.ip2location.io" title="IP2Location.io IP Geolocation API" rel="nofollow ugc">IP2Location.io IP Geolocation API</a>. A free plan is available.
<h4>More Information</h4>
Please visit us at <a href="https://www.ip2location.com" title="https://www.ip2location.com" rel="nofollow ugc">https://www.ip2location.com</a>

IP2Location Country Blocker

Plugin does it job, it blocks unwanted countries
Although it misses some functionality:
1. Not possible to set a threshold after which the IP gets blocked forever.
2. The email sent is not very clear from which part of the site it is coming frontend or backend


Great plugin for blocking foreighn countries

Blocks unwanted visitors from accessing your frontend (blog pages) or backend (admin area) by countries or proxy servers.

QR Redirector vs IP2Location Country Blocker