Unusual website traffic from 174.192.*.*

Was looking at my website logs and noticed a huge amount of traffic from various IP addresses all in the 174.192.. class B subnet. These all traceback to Verizon Wireless I believe. I looked deeper and I could see one of these IPs request the same webpage more than once a second! It seems as if almost like some sort of distributed attack launched from compromised smartphones? Anyone else run into this?