engine - 4:33 pm on Mar 18, 2013 (gmt 0)
About 50% of all junk mail on the net emerges from just 20 internet service providers (ISPs), a study has found.
The survey of more than 42,000 ISPs tried to map the net's "bad neighbourhoods" to help pinpoint sources of malicious mail.Study: 50pct of All Email Spam Comes From Only 20 ISPs [bbc.co.uk]
Many of these networks were concentrated in India, Vietnam and Brazil. On the net's most crime-ridden network - Spectranet in Nigeria - 62% of all the addresses controlled by that ISP were seen to be sending out spam.
Networks involved in malicious activity also tended to specialise in one particular sort of malicious message or attack, he discovered. For instance, the majority of phishing attacks came from ISPs based in the US. By contrast, spammers tend to favour Asian ISPs. Indian ISP BSNL topped the list of spam sources in the study.