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Accurate mapping of Autonomous Systems (ASes) to their owner organizations is fundamental for understanding the structure and dynamics of the Internet. However, as AS numbers have traditionally been delegated in an ad-hoc manner and organizational ownership has evolved over time, many organizations have registered resources under different names. Traditionally, researchers have relied on datasets like AS2Org, which map ASNs to organizations primarily using WHOIS records, but WHOIS inconsistencies often lead to missed and false relationships. We propose a new approach by leveraging the Resource Public Key Infrastructure (RPKI) to map ASNs to their managing organization. Our methodology combines multiple data sources: WHOIS records to extract organization names, RPKI certificates to identify potential siblings, and Large Language Models (LLMs) to find evidence not visible in WHOIS records currently. This integrated approach enables a more robust and accurate mapping of ASNs to organizations, notably improving inferences for 14% of multi-ASN clusters. 

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Society increasingly relies on the Internet as a critical infrastructure. Inter-domain routing is a core Internet protocol that enables trac to flow globally across independent networks. Concerns about Internet infrastructure security have prompted policymakers to promote stronger routing security and the Resource Public Key Infrastructure (RPKI) in particular. RPKI is a cryptographic framework to secure routing that was standardized in 2012. In 2024, almost 50% of routed IP address blocks are still not covered by RPKI certificates. It is unclear what barriers are preventing net- works from adopting RPKI. This paper investigates networks with low RPKI adoption to understand where and why adoption is low or non-existent. We find that networks’ geographical area of service, size, business category and complexity of address space delegation impact RPKI adoption. Our analysis may help direct policymakers’ efforts to promote RPKI adoption and improve the state of routing security.