Upstream Adjacent AS list AS2828 XO-AS15 - MCI Communications Services, Inc. d/b/a Verizon Business, US AS174 COGENT-174 - Cogent Communications, US AS3257 GTT-BACKBONE GTT, DE AS6461 ZAYO-6461 - Zayo Bandwidth, US AS7473 SINGTEL-AS-AP Singapore Telecommunications Ltd, SG