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more information about yf1.yahoo.com dns delegation
What IP addresses does the host name yf1.yahoo.com use? Yf1.yahoo.com uses the IP address 18.104.22.168 hosted by Yahoo Anycast 1 Netblock 2 in Sunnyvale, United States, which also yf4.yahoo.com use. ... www.robtex.com:yf1.yahoo.com