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pia-vpn-ranges
A list of all IP blocks used by the Private Internet Access VPN service. Useful for firewall whitelisting.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
But nonetheless they are often partly or wholly documented, and sophisticated security providers make it their business to maintain lists like that. Companies usually have one or more of those security providers on retainer and may work with them to understand firewall logs.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.