208.67.222.123
This DNS can save you.
It's the DNS for OpenDNS Family Shield, a free service by OpenDNS.
Once configured on your laptop, smartphone or router, this DNS protects your network from phishing sites, malwares distributors, and **adult content**. Any attempts to access these types of sites will be automatically blocked.
For setup instructions, check out OpenDNS's guide: Setup guide OpenDNS FamilyShield
With this configuration, it's easier to keep your home and corporate network safe. Plus, it can also help against certain "bad habits", if you know what I mean.
Hope this is useful to you!