Bitcoin start-up

[Symbiosis]

Just started to get into bitcoins and have a question I cant find an answer to here in the forums.  When I start my bitcoin up i get a couple of ip addresses not on port 8333.

70.86.96.218:80
208.78.68.70:80
98.124.198.1:80
208.78.69.70:80
92.243.23.21:6667
then
x.x.x.x:8333
x.x.x.x:8333
and so on

It always happens when I start the bitcoin client.  I thought at first nbd.  But when I google search these addresses, sites that list botnets, siteadvisers, and other websites listing as suspicious for some of these addresses.
I keep watching my ip logs, and these addresses only appear immediately after starting bitcoin.  Does anyone if this is a bitcoin thing or something else?

[1714956545]

1714956545

[1714956545]

1714956545

[theymos]

The port 80 addresses are used for determining your external IP addresses (www.ipaddressworld.com, checkip.dyndns.org). Port 6667 is IRC, which Bitcoin uses for bootstrapping (irc.lfnet.org).

It's also possible for Bitcoin peers to run on different ports, though they would have to modify the source code.

[Symbiosis]

ive blocked these addresses initially, and the bitcoin client is still generating coins and downloading blocks.  If this is the case, why run thru these different ports at all. 
So for instance, I just started bitcoin, i get this address

192.75.207.148:6667

I google the address, and the first 4 sites on the list are all from www.emergingthreats.net.

and this ip address

98.124.198.1:80

Google this one and the 3rd site down is www.malwareurl.com and the 4th site is malwarebytes forum where someone asks why this site gets blocked and the moderator replies: This IP is sadly home to over 30 malicious websites, which is why it is blocked.

I just dont understand why bitcoin would even connect to any IP address in question, whether its legit or not.

[theymos]

Probably all 4 billion IP addresses are on some black list or other. These lists are extremely unreliable.

Feel free to block them if you want. Bitcoin will use the backup bootstrap method, which is slower but just as effective.

[Symbiosis]

Thx, didnt know if it was anything to worry about or not.