39 operation of a telecommunications system or the management of a telecommunications service.” 47 U.S.C. § 153(24). The Commission found that “[w]hen offered as part of a broadband Internet access service, caching [and] DNS [are] simply used to facilitate the transmission of information so that users can access other services.” 2015 Open Internet Order, 30 FCC Rcd. at 5770 ¶ 372. Challenging this interpretation, US Telecom argues that DNS and caching fall outside the exception because neither “manage[s] a telecommunications system or service,” US Telecom Pet’rs’ Br. 39, but are instead examples of the “many core information-service functions associated with Internet access,” id. at 37. US Telecom claims that the Commission’s use of the telecommunications management exception was also unreasonable because the Commission “contends that the same functions—DNS and caching—are used for telecommunications management when offered as part of Internet access, but are an information service when thirdparty content providers similarly offer them.” Id. at 40. We are unpersuaded. First, the Commission explained that the Communications Act’s telecommunications management exception encompasses those services that would have qualified as “adjunct-to-basic” under the Computer II regime. 2015 Open Internet Order, 30 FCC Rcd. at 5766–67 ¶ 367 (citing Non-Accounting Safeguards Order, 11 FCC Rcd. at 21,958 ¶ 107). To qualify as an adjunct-to-basic service, a service had to be “‘basic in purpose and use’ in the sense that [it] facilitate[d] use of the network, and . . . [it] could ‘not alter the fundamental character of the [telecommunications service].’” Id. at 5767 ¶ 367 (last alteration in original) (quoting In re North American Telecommunications Ass’n, 101 F.C.C. 2d 349, 359 ¶ 24, 360 ¶ 27 (1985)) (some internal quotation marks omitted). The Commission concluded that