what website can I use to find my public Ip with subnet mask

I know of websites that you can go to check your public IP address. Anyone one knows of a website where I can find the Ip address and the subnet mask?

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Comments

dtlokee

www.portforward.com will show the external IP address on the first page, but there are others.

dynamik

Shields up will show your public IP as well as do port scans to test for security vulnerabilities: https://www.grc.com/x/ne.dll?bh0bkyd2

I don't think there is a way for a remote website to determine your subnet though.

Ahriakin

I don't think the mask can be read from a remote host. It's only relevant locally to provide a logical representation of your topology to TCP/IP. External routers will summarise routes that may ultimately include your IP but only use whatever mask best suits that route.

cacharo

www.whatismyip.com

garv221

cacharo wrote:

www.whatismyip.com

the only one I use

JdotQ

cacharo wrote:

www.whatismyip.com

I also use this one.

But another one is http://www.ipchicken.com/

DevilWAH

As has been said there is no way to determine your sub-net mask from the internet.

Well at some point the powers that be will have assigned your ISP a block of IP address, but this may be entire clas B network, they will the have subnetted this and decided what parts of it they will assign to there clients (ie you) what they will use for web hosting and other services ect and what will be reserved.

If you have been assigned a static IP addres then it should be registered and doing a look up on your external IP at whois.net will show you who the address is registered and what range they own.

for example Google has an IP (from here) of 173.194.34.67

NetRange: 173.194.0.0 - 173.194.255.255
CIDR: 173.194.0.0/16
OriginAS: AS15169

that is about the best you will find

Sett

If you want to see how the internet hosts route traffic to your external IP just go to any looking glass or route-server, for example route-server.ip.att.net and check the route for your external IP there. It would be summarized route, there is no way you could check the locally configured subnet mask. Well, technically you could send mask request ICMP message, but the chances are that these are filtered.

swabbies

Hurricane Electric BGP Toolkit contains interesting information regarding your source ip and how it is advertised from your carrier.