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Most administrators feel their dial-up servers are secure since no one outside the company knows their phone numbers. That is where information gathering and wardialers come in.
- Hackers find the voice numbers to the company. Chances are the dial-up numbers start with the same prefixes.
- Some companies even put voice numbers on their Web page.
- Hackers can also get numbers from phone books or other information sources.
- Hackers can check the name and number registered with the InterNIC.
- The number listed is probably the Network Operations Center (NOC), and is often where the modems are usually located.
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