AS11313 FANNIEMAE

FANNIEMAE is the Federal National Mortgage Association — Fannie Mae, the US government-sponsored enterprise that buys mortgages from lenders and packages them into securities. It is a shareholder-owned corporation under federal conservatorship, not a government agency, and its network reads as pure enterprise.

What it's used for

RIS sees 41 IPv4 prefixes, 10,496 addresses, no IPv6 and only 2 observed neighbours. The prefix count is high relative to the address count because the inventory is almost entirely /24s, drawn from two blocks: 167.133.0.0 and 198.204.128.0 upward. Every prefix in the pack is registered to Fannie Mae, under two netnames — MORNET and FNMA-CNETS. Registrant and origin agree throughout, so there is no third-party space and nothing broker-shaped in the inventory, however long the prefix list looks.

Notable

Forty-one prefixes announced to two neighbours is the shape that matters. A network that peers with two ASes is buying transit, not selling it, no matter how many routes it originates. What produces the long /24 list is not connectivity ambition but segmentation: a financial institution that keeps distinct, separately-routable public blocks for its data centres, its DMZs, and its lender-facing interfaces, because counterparties, regulators and firewall policies allowlist by source address and a stable per-function /24 is what makes that possible.

Interesting

The MORNET netname is corporate archaeology in the registry. Fannie Mae's lender-facing electronic delivery network carried that name for years, and the address blocks that served it still wear it — an internal system name outliving the system, which is a common fate for netnames and a reminder to read the org field rather than the label.