Autonomous system
AS10423 SPARTAN-NET
Residential ARIN
Summary
STELLAR Broadband
residential isp fiber mdu
SPARTAN-NET is STELLAR Broadband, a Michigan fiber ISP founded in 2001 and originally trading as Spartan Net in East Lansing. It sells gigabit and multi-gigabit fiber Internet into apartment buildings, student housing and mixed-use developments.
What it's used for
- Residential broadband delivered to multi-dwelling units (MDUs): student housing around Michigan State, plus multifamily communities in Lansing, Grand Rapids and south-east Michigan. Addresses here are subscribers behind a fiber drop.
Notable
- Eyeball network, not hosting or transit. RIS sees 2 IPv4 prefixes carrying 16,384 addresses plus one IPv6
/32(2604:71c0::/32), against 20 observed BGP neighbours. Twenty neighbours is a regional ISP that peers where it can and buys a couple of transits — not a carrier, which would show hundreds. - The decisive evidence is reverse DNS: every sampled address across both
72.44.96.0/19and69.176.128.0/19resolves to a generic<dashed-ip>.stellarbb.comname. Sequential, machine-generated PTRs spanning the whole allocation are what an access network puts on a subscriber pool; server and colo space gets individually named hosts instead. - The rDNS also confirms the holder is first-party. The prefixes are announced by the same company whose domain appears in the PTRs, which rules out the address-broker shape entirely.
Interesting
- The
SPARTAN-NEThandle long outlived the brand — the company rebranded to STELLAR but kept the AS handle, a reminder that a registry handle is a historical artefact and never evidence of who runs the network today.
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
Recorded at 3 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Equinix Internet Exchange Ashburn | Ashburn, United States | 206.126.238.57 |
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.44 |
| Detroit Internet Exchange | Detroit, United States | 209.124.52.15 |
Transit providers
7 upstream, 1 downstream and 13 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 16.38K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 3 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS10423- Registry name
- SPARTAN-NET
- Registrant
- STELLAR Broadband
- Abuse contact
- abuse@stellarbb.com
- Registered
- 2005-05-04
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 3 authorising AS10423
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 3 naming AS10423
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 448 networks and 1,849 prefixes, as published 2026-10-29. 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