Copyright Goodheart-Willcox Co., Inc. Chapter 8 Overview of Network Security and Network Threats 257 Quick Look 8.1.2 Continued 3. Navigate to the site ip-lookup.net. This is one of the many reverse–IP–lookup tools available on the Internet. 4. Enter 152.152.31.120 in the IP address search box, as shown. What is the name of the host? What country is this located in? 5. Click the Domain tab at the top of the web page. Enter the domain name (host) you found in the previous step. What is the IP address registered to that domain? 6. Navigate to the site whois.icann.org. This is the WHOIS lookup tool. 7. Enter the address chicagobears.com in the domain lookup text box. If you were getting malicious packets from this domain, what e-mail address would you use to get assistance from this organization? 8. Scroll down the page. When was the last time this organization updated the registration? When does it expire? 9. Look up the domain of your school system. Review the information about your school’s registration. 10. Navigate to the IANA website (www.iana.org). 11. Click the Number Resources link on the home page. 12. Scroll down to the IP Address Allocations area of the page, and click the IPv4 Address Space link. 13. Suppose you receive a malicious packet with the address of 186.17.200.45. Which RIR handled that IP address? 14. Apple Computer was an early adopter of TCP/IP. It has been given a legacy assignment. What is the fi rst octet it was given? Hint: use the browser’s fi nd function to search the list. 15. A company in Mexico wants to become an ISP. Which RIR handles this request? Enter the address to look up IPv6 Basics The IPv6 protocol was developed with many goals in mind. Two goals were improved security and an increased number of IP addresses. These requirements meant a completely new format of IP address was needed. IPv6 Addresses With IPv4, there are 4.3 billion (4,300,000,000) possible addresses. This number is equal to 2 raised to the power 32 (232). However, IPv6 offers 2128 (340,282,366,920,938,463,463,374,607,431,768,211,456) possible addresses. IPv6 uses addresses based on the hexadecimal, or Base 16, numbering system. This number- ing system includes the value 0–9 and A–F, as shown in Figure 8-7. What happened to IPv5? IPv5 was originally developed as a protocol for streaming video, but it still used the 32-bit–octet formula for addresses. Due to the limited number of available addresses, the IPv5 standard was abandoned before it ever got adopted. FYI