Automated Indicator Sharing (AIS) is a system for sending and receiving cyber threat indicators between organisations in near real time so defenders can spot known bad activity faster. In practice it is a feed that carries items such as malicious IP addresses, domains, URLs, file hashes and simple patterns that match malware or phishing. Each item is an IOC with context like when it was seen, how confident the source is, and what type of threat it relates to. Many AIS deployments use open formats such as STIX to describe the indicators and TAXII to move them, which lets different tools subscribe without custom code. Records are typically marked for handling with labels like TLP colours so recipients know how widely they can share them. The United States runs a large AIS programme through CISA, and many industry groups and national centres run similar services. The core idea is the same everywhere. A trusted hub collects indicators from members, strips out any personal or sensitive content, normalises the fields and republishes them to subscribers. Security tools then ingest the feed to update blocklists, detection rules and hunts. AIS does not replace deeper intelligence reports or human analysis. It adds a fast channel for concrete, machine-readable clues that many defenders can act on at once.
