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   Are you limited to 216?
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In this table you will find the traditional 216 web safe colours. You usually get them presented in 6×6×6 cubes, but here I have roughly arranged the colours from saturated to less saturated, as I have found that this is what I most often need.
But is one actually still limited to designing with only 216 available colours? Read my comments about web safe colours below...

The above colours are listed with hex values. The hex value placement is red-green-blue:

This table shows colour conversion:

The above example, FF3399, thus consists of 100% red, 20% green and 60% blue, which gives a dark pinkish colour like this:

Colour display is quite a complex issue, with different gammas and what have you.
On a more mundane level, here´s a piece of advice for users of TFT screens: On some older or cheaper TFT screens certain colours have a tendency to fool you; notably CCCCFF, which can look grey like CCCCCC, but really gets a purple shade due to its 100% blue (the FF in CCCCFF). If you are using a TFT screen right now, try looking at the two boxes below from different angles:

CCCCFF	CCCCCC

Should you require another presentation of the web safe colour palette, I recommend:

Is one limited to using web safe colours?
No, I don´t believe one is ... anymore. Because how often are web pages viewed on 8-bit (256 colour) screens these days? My statistics package for this site says “never” as far as these pages are concerned.

Of course it all depends on which audience you are designing for, but if your audience uses just relatively current computers, I see little reason for sticking with the traditional 216 colours (only 216, as 40 of the 256 available 8-bit colours were omitted in order to make the colours safe for cross-platform PC/Mac use). Which is fine, for the web safe palette seriously lacks tints.

However, if you are designing for handhelds, mobile phones, etc. the situation may be different, as some of these devices still have pretty few colours to play with. Again, the more you know about your audience´s equipment (and how they use it), the better decisions you are able to make.