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2. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   It is important to note that this is the reverse order to the usual dotted-decimal convention for writing IPv4 addresses in textual form. For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google.

3. Reverse image search - Wikipedia

   en.wikipedia.org/wiki/Reverse_image_search

   An image search engine is a search engine that is designed to find an image. The search can be based on keywords, a picture, or a web link to a picture. The results depend on the search criterion, such as metadata, distribution of color, shape, etc., and the search technique which the browser uses.

4. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   800 toll-free numbers are commonly called "800 免费电话". The official name is "被叫集中付费业务" (called party collect paid service), which means the cost of the call is borne not by the caller but by the party receiving the call. 800-toll-free numbers in China are ten-digit numbers beginning with "800". There is no prefix before ...

5. Whitepages (company) - Wikipedia

   en.wikipedia.org/wiki/Whitepages_(company)

   Whitepages is a provider of online directory services, fraud screening, background checks and identity verification for consumers and businesses. It has the largest database available of contact information on residents of the United States.

6. United States dollar - Wikipedia

   en.wikipedia.org/wiki/United_States_dollar

   Reverse Obverse portrait and design date ... Notes in denominations of $500, $1,000, $5,000, $10,000 (discontinued, ... to $800 billion in 2005, and to over $3 ...

7. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Several other prefixes, including 800-484, 800-703, 800-744, and 800-904 are reserved by the FCC. NPA-911 is forbidden as 9-1-1 is an emergency telephone number . (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.)