Where's Waldo Library? Using Reverse IP Geolocation to Identify Library IPs. - Nishant Acharya; Anyu Yang; Humaira Fasih Ahmed Hashmi; Kevin Vermeulen; Shivani Kalamadi; Jiayi Liu; Ashutosh Kshirsagar; Elizabeth M. Belding; David R. Choffnes; Alexander Gamero-Garrido (CoRR, 2026)