AS10599 MCKESSON

MCKESSON is McKesson Corporation, the American healthcare-supply-chain company that distributes a very large share of the pharmaceuticals dispensed in North America and sells the software and services that pharmacies, providers and payers run on. The sampled reverse DNS, vdas-east.mckesson.com, is first-party — the network is McKesson's own.

What it's used for

RIS observes 18 IPv4 prefixes carrying 147,968 addresses, no IPv6, and 7 observed BGP neighbours. The address count is genuinely large — bigger than plenty of ISPs in this range — but the peer count keeps it honest: seven neighbours is a multi-homed enterprise buying transit, not a network selling it.

The structure is corporate. There is a legacy 149.21.0.0/16, a 143.112.0.0/16-worth of space announced as its component /17s, /18s and /19s, and 206.203.64.0/18, with a further scattering of /24s punched out for traffic engineering. Deaggregating your own blocks like this is how a company with many sites and multiple carriers steers each one. Behind it sits the estate you would expect from a Fortune-10 firm: distribution centres, pharmacy systems, data centres, corporate offices and the extranets that connect them to customers.

Notable

At least one announced /24 sits in RIPE-region address space rather than ARIN's, which is what a multinational's routing looks like when European operations are announced from the same ASN as the US ones. A company can hold space from more than one registry without any of the address-brokerage implications that pattern sometimes carries — here, every block traces back to the same first-party operator.