OCN 516C — At&t Corp.

Operating Company Number (OCN) 516C identifies At&t Corp. in North American telephone routing records.

Area codes with At&t Corp. numbers

• 661 (2)
• 281 (1)
• 323 (1)
• 361 (1)
• 409 (1)
• 510 (1)
• 650 (1)
• 786 (1)
• 810 (1)
• 817 (1)
• 831 (1)
• 832 (1)
• 843 (1)
• 916 (1)
• 925 (1)
• 256 (1)
• 937 (1)

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Last updated: February 7, 2026