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"After very little research we quickly came across Cisco mis-using 1.1.1.1, a quick search for “cisco 1.1.1.1” brought up numerous articles where Cisco are squatting on 1.1.1.1 for their Wireless LAN Controllers (WLC). It’s unclear if Cisco officially regards 1.0.0.0/8 as bogon space, but there are lots of examples that can be found on their community websites giving example bogon lists that include the /8. It mostly seems to be used for captive portal when authenticating to the wireless access point, often found in hotels, cafés and other public WiFi hotspot locations."

from: https://blog.cloudflare.com/fixing-reachability-to-1-1-1-1-g...