Type site:www.yoursite.com and if your site comes up your indexed if not your banned or have not been indexed yet.
Also if you are identified as having dangeous malware on your website you could have your URL blocked so that when anyone tries to enter your website it google would show a warning page then not allow you to the URL. To test this again just search and google should warn you.
Let say for some reasom your website gets blocked by google. Would Google send an email to the webmaster informing of site blocked?
The easiest way to find out about your site is already mentioned above by many of the members. You could check it out by google search or by typing your site name on the address bar and press enter, its simple.
Last 3 weeks it was indexed but when I checked it wasn't. Then I'm on to page 18 already, and still no sign of my site being listed there so I thought it had been blocked. Well, now it's back to indexed. Thanks to all!
If your page / site is new, it will bounce around the rankings A LOT. In addition, each time you search you could potentially be hitting a different datacenter. Each dc will have slightly (to significantly) different results depending on the key term and how new your page / site is. SEO is long term investment with long term results. Patience is a must.
New site shows and hides from search results, its normal. Does not means that have being blocked at all.
In addition to the normal view the site included, site traffic has been a factor in google penalty!If the recent traffic is abnormal, or very severe decline, there may be penalties google