Related Clues:

• Address letters
• URL leader
• Letters followed by a colon
• Intro to a 37 Across
• Millions of addresses start with it
• Start of a 55-Across address
• URL start
• It follows '//' in a URL
• :// preceder
• Internet address opening
• Web address opening
• Often implied letters in an online address
• Certain address starter
• Web starter
• It often follows http://