Autonomous system
AS11517 BLUE-CROSS-AND-BLUE-SHIELD-OF-MINNESOTA
Unclassified ARIN
Summary
Blue Cross & Blue Shield of Minnesota
enterprise legacy
BLUE-CROSS-AND-BLUE-SHIELD-OF-MINNESOTA is the Minnesota licensee of the Blue Cross Blue Shield Association, a nonprofit health insurer. The AS carries the insurer's own corporate network, nothing else.
What it's used for
- Enterprise connectivity for a health plan: member and provider portals, claims systems, corporate offices, and the private interconnects that a US health insurer needs with providers and clearinghouses.
- RIS sees 17 announced IPv4 prefixes totalling 7,936 addresses, no IPv6, and only 2 observed BGP neighbours. Two neighbours against eight thousand addresses is the signature of a multihomed end site: the company buys transit from a pair of providers and sells nothing onward.
Notable
- Every prefix RIS sees is carved out of a single
159.136.0.0/16— a stack of /22s, /23s, and /24s such as159.136.24.0/22,159.136.8.0/23, and159.136.145.0/24. The deaggregation is internal segmentation of one legacy allocation, not an assembled inventory, and it is what a large enterprise looks like when it announces per-datacentre or per-function blocks separately. - All sampled prefixes register to Blue Cross & Blue Shield of Minnesota under a single ARIN handle,
USBCBSMN01. Registrant and holder agree everywhere, so there is no leased-space or third-party pattern to worry about.
Interesting
- Reverse DNS did not answer on the addresses sampled, which for a network like this is unremarkable and proves nothing either way. A health insurer's routed space is mostly internal and partner-facing rather than public web hosting, so there is little reason for most of it to carry public PTRs. The registration and the routing shape, not DNS, are what identify this network.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 11 prefixes · 7.94K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 11 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11517- Registry name
- BLUE-CROSS-AND-BLUE-SHIELD-OF-MINNESOTA
- Registrant
- Blue Cross & Blue Shield of Minnesota
- Abuse contact
- paul.cicha@bluecrossmn.com
- Registered
- 2006-04-07
- Last changed
- 2021-01-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 17 with no ROA
- ROAs
- 0 authorising AS11517
- ASPA
- no ASPA record
- IRR
- 100% registered · 17 of 17 announcements
- Route objects
- 15 naming AS11517
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 446 networks and 1,852 prefixes, as published 2026-10-27. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere