AS5696 — EXPRES

AS5696 announces 5 IPv4 prefixes covering 131,840 addresses and 0 IPv6 prefixes.

About this network

EXPRES is Express Scripts, the pharmacy benefit manager headquartered in St. Louis, Missouri and now part of Cigna's Evernorth business. AS5696 is its corporate network.

What it's used for

• Carrying Express Scripts' own traffic — the systems behind prescription claims processing, mail-order pharmacy, and the member and pharmacy-facing services that go with them.

Notable

• An enterprise network, not a provider: the ~132,000 addresses here belong to the company's own infrastructure rather than to customers.
• Its upstreams include a DDoS-mitigation network alongside ordinary transit — a defensive posture you would expect from a company sitting on a very large volume of health and prescription data.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 167.18.0.0/16
• 167.211.0.0/16
• 198.27.9.0/24
• 199.204.156.0/24
• 199.204.159.0/24

Upstream networks

• AS32787 Akamai Technologies, Inc.
• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC

Adjacent networks

• AS32787 Akamai Technologies, Inc.
• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 46 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 56 route objects.
• Listed in as-sets: AS-KDDCUSTOMER2, AS-PROLE, AS-TELSTRA-INTL-CUSTOMERS.