Just another contact form plugin. Simple but flexible.
About IP Ban
IP Ban is a security plugin that allows you to block unwanted IP addresses or user agents from accessing your site. It also helps protect your site from unwanted crawlers. After activating the plugin, you can add IP addresses or user agents to your blacklist and define a redirect URL for spammers.Screenshots

Changelog
1.3.0
- [Test] WordPress 4.7
- [Fix] Plugin may not ban well on all hosting providers and on wide ranges of IP
(like 125.80.0.0 125.87.255.255), due to the fact that ip2long can return negative values in some cases.
(Reported by Fernando) - [Test] WordPress 4.4.1
1.2.6
- [Test] WordPress 4.3.2
- [Test] WordPress 4.3.1
- [Test] WordPress 4.3.0
- [Test] WordPress 4.2.1
1.2.5
- Fix: Warning: Missing argument 2 for wp_kses() error message (2 posts) – https://wordpress.org/support/topic/warning-missing-argument-2-for-wp_kses-error-message
1.2.4
- Add CSRF protection and sanitize user input
- [Test] WordPress 4.0.1
1.2.3
- [Test] WordPress 4.0
1.2.2
- [Test] WordPress 3.9.1
1.2.1
- Fix: Notice: Undefined index: submit in ip-ban.php on line 37 – https://wordpress.org/support/topic/notice-undefined-index-submit-in-ip-banphp-on-line-37
- Tested with 3.8.1
1.2.0
- Fix: Too many redirects – https://wordpress.org/support/topic/too-many-redirects-22
1.1.8
- Update for WordPress 3.8
1.1.1
- Update for WordPress 3.5.1
1.1.
- Add IP Range to the banned IPs list. ex: 82.11.22.100-82.11.22-177
- For Admin user it’s not active
- Added checkbox: enable / disable redirection for logged in users ( others than admin )
1.0.1
- Update readme.txt.
1.0
- First version.