I've tried inurl:http but it takes forever to get even a bunch of sites right and I have to think of new keywords everytime to get the sites.
Is there kind of a directory I could use to get the address of all the sites on the public web?
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There are an estimated 1.6 billion public websites in the world, with 200 million being active. But no one really knows, because a website can be just an IP address with no domain, or an .onion link, or temporary or short-lived, or weather-dependent, ...
One way would be to use known DNS records (domain names) from the 2013 DNS Census.
It is a DNS registration dataset snapshot taken in 2013. Compressed - it is ~15GB and uncompressed 157GB.
They claim it contains: Dataset containing 2,676,380,336 DNS records and 106,928,034 domains
A more modest list would be, for example, the Alexa 1 million list:
Scripts for scanning the Alexa top 1 million sites and providing generic statistics about them.
Direct link: http://s3.amazonaws.com/alexa-static/top-1m.csv.zip
Here's an estimate about how big your
for loop will get:
According to Reserved IP addresses there are 588,514,304 reserved addresses and since there are 4,294,967,296 (2^32) IPv4 addressess in total, there are 3,706,452,992 public addresses.