What is 151.101.1.57?
151.101.1.57 is an IP address in the Fastly CDN network (AS54113). Fastly is a cloud computing services provider that operates an edge cloud platform used by major websites including Reddit, GitHub, Stack Overflow, and The Guardian. IPs in the 151.101.0.0/16 range are part of Fastly's anycast CDN infrastructure.
Privacy note
A Fastly IP appearing in a connection trace means the content is being served through Fastly's CDN edge, not directly from the origin server. This is normal for sites using Fastly for performance and DDoS protection.