MADISON HOLDINGS B.V. — IP ranges & network footprint

IP Ranges (4)

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CIDR	Org name	Registry	Status	Confidence
208.115.136.78/32	Madison Communications, Inc.	PEERINGDB	ASSIGNED	● high
2001:504:0:4:0:1:8596:1/128	Madison Communications, Inc.	PEERINGDB	ASSIGNED	● high
2a00:2381:90f::/48	MADISON	RIPE	AGGREGATED-BY-LIR	● low
2a00:2381:90f::/56	MADISON	RIPE	ASSIGNED	● low

IPv6 ranges (3)

CIDR
2a00:2381:90f::/48
2a00:2381:90f::/56
2001:504:0:4:0:1:8596:1/128

Corporate group (2 confirmed entities)

OTIS Elevator Company 4 blocks

Possibly related to this organisation

what's this?

Same name family

Separately-registered clusters whose names share “Madison” — often per-country or per-system registrations of the same brand, occasionally a different organisation sharing the name. Not counted in this organisation's own footprint.

Madison Telephone Company 16 blocks
Madison County Telephone Company 5 blocks
Madison-Clothing-GmbH 4 blocks
Madison-Oneida BOCES 3 blocks
MADISON TECHNOLOGIES MALAYSIA PLT 2 blocks
Madison Co Memorial Hospital 2 blocks
Madison Commercial Real Estate Services, LLC 2 blocks
Madison County New York 2 blocks

Combined view of all 21 name-family clusters →

Sub-allocations under carriers

IP blocks an ISP reassigned to a similarly-named customer — decoded from the ISP's own naming convention, not a direct registration.

IPMADISON via JSC Kazakhtelecom sub-allocation
ZEN20020212-DAR-MADISONFILTER via Zen Internet Ltd sub-allocation
A1SI-MADISON-SYSTEMS via A1 Slovenija telekomunikacijske storitve,d.d. sub-allocation
MADISON-GURKHA via KPN B.V. sub-allocation
MADISONCENTROSPORTIVOSNCDIMAND sub-allocation
Pipex Madison via Wavenet Limited sub-allocation
MADISONSRL sub-allocation
JAMESMADISONUNIVERSITY sub-allocation

Network trust

what's this?

RPKI hygiene: C how networks compare →

50.0% of checked blocks have valid RPKI ROA coverage (2 of 4)

Possible discrepancies (2)

These blocks are registered to Madison Communications, Inc. but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a00:2381:90f::/48 /48	authorized for AS2856 — British Telecommunications Limited
2a00:2381:90f::/56 /56	authorized for AS2856 — British Telecommunications Limited

NIC Handles

AS18596 BTNET-MNT DUMY-RIPE DUMY-RIPE

Netblocks	4
IPv6	3 prefixes (largest 2a00:2381:90f::/48)
Also registered under this name	55 netblocks across 21 separate records
Record ID	236457883
Registry	PEERINGDB
Owner jurisdiction	NL
Customers	see who runs inside this network →

Attribution	GLEIF legal-entity match
Legal identity	LEI 549300G8Z21Z5PCPNF73
Shared handles	clustered on 4 shared RIR contact/maintainer handles
Registry names	2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue