Friday, September 14, 2007

Computer facts

IP (Internet Protocol), the way computers talk on the internet, defines an addressing scheme so that every device attached to a network can be uniquely identified and contacted.

IPv4 (IP Version 4), which is what we are currently using, allocates 32 bits for addresses. Hence there are up to 232 = 4,294,967,296 addresses. 4 billion addresses for computers, etc.

However, we are running out of IP addresses. The next version of IP, version 6, allocates 128-bits for identifying each network device. That is, there will be 2128 = 3.4 x 1038 = 340,000,000,000,000,000,000,000,000,000,000,000,000 addresses.
There are 7.5 x 1018 grains of sand in all the worlds beaches.There are 1028 atoms in your body. IPv6 will give us 3.4 x 1038 addresses for computers, etc.

The sentence: "The quick brown fox jumps over the lazy dog" uses every letter of the alphabet.

Anthony Greco, 18, became the first person arrested for spim (unsolicited instant messages) on February 21,

Spam accounts for over 60% of all email, according to MessageLabs.
America Online (AOL) says that at any time between 1/3 and 2/3 of its server capacity is taken up by spam.

The first computer "bug" was a real bug.
In 1947, engineers found a moth in Panel F, Relay #70 of the Harvard Mark 1 system. The computer was running a test of its multiplier and adder when the engineers noticed something was wrong. The moth was trapped, removed and taped into the computer's logbook with the words: "first actual case of a bug being found."

Around 1% of the world's 650 million corporate e-mail accounts are plugged into hardware and software that forwards incoming messages to a mobile device. And about 3.65 million of them use a BlackBerry.
An estimated 126 million employees use Microsoft Outlook on desktop.

Almost half of people online have at least three e-mail accounts.
In addition, the average consumer has maintained the same e-mail address for four to six years.

In 2005, AOL blocked an average of 1.5 billion spam messages per day.
Approximately eight in 10 e-mails received at its gateway were blocked as junk.

Mr Tomlinson has been called the father of e-mail because, back in 1971, he invented the software that allowed messages to be sent between computers

There are now more than 100 million websites on the internet!
Counting only domain name sites with content, Netcraft has tracked the growth of the internet since 1995 and says of the 100m, around 48 million are active sites that are updated regularly. When it began observing sites through the domain name system in 1995, there were 18,000 web sites in existence.

No comments: