How to Detect Suspicious IP Addresses

One of the most important talents a cybersecurity expert must have is the ability to detect and block a suspicious IP address.

What is an IP address?

Assigning an IP address to the devices with an internet connection serves two purposes: identification and addressing. With the help of IP addresses, one can identify the host and/or the network, and address the location of the device.

Internet Assigned Numbers Authority (also known as the IANA) manages the IP address space globally and has five distinct regional Internet Registries that manage different regions on the globe.

There are two different versions of the IP addresses. One is a rather dated version called ARPANET which was first used in 1983. The other one is called Internet Protocol version 4 (also known as the IPv4).

As of today, both of these Internet Protocol versions are used simultaneously.

What does suspicious IP mean?

Being able to detect suspicious IP addresses and blocking them before they cause any harm is an essential skill for a cybersecurity professional to have.

What is IP reputation?

Why is IP reputation important?

How do you determine an IP reputation score?

Here are some of the parameters that may be used in gauging IP reputation.

  • IP category
  • Age of the IP
  • History of the IP
  • Domain reputation
  • Associated URL reputation
  • Presence of downloadable files or code
  • Previous association with malicious internet objects
  • Current association with malicious internet objects
  • Popularity
  • Hosting location
  • Real-time performance
  • Website and/or network owner
  • Presence on any allow/blocklists

Analyzing the above types of characteristics can yield a very accurate assessment of the level of risk associated with a given IP address.

Free Online Tools for Looking up Potentially Malicious Websites

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What is IP Reputation? | Webroot
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