MARSH & MCLENNAN COMPANIES, INC.
Marsh & McLennan Companies, Inc.
Data as of 2026-07-26
GLEIF verified
Complete entity footprint
5 linked clusters ·
85 netblocks ·
240,612 IPv4 addresses ·
1 IPv6 prefixes
This organisation's clusters combined by evidence —
shared GLEIF corporate family
— not name similarity, so genuinely different organisations that share a name are excluded.
LEI
549300XMP3KDCKJXIU47
Registered name
MARSH & MCLENNAN COMPANIES, INC.
Jurisdiction
Ultimate parent
No parent on file in GLEIF
Cluster stats
| Netblocks | 9 · 34,816 IPv4 addresses |
| IPv6 | 1 prefix (largest 2001:df2:fc80::/48) |
| All fragments | 11 blocks across 2 clusters |
| Cluster ID | 213464250 |
| Registry | APNIC |
| Owner jurisdiction | US-DE |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | GLEIF legal-entity match |
| Legal identity | LEI 549300XMP3KDCKJXIU47 |
| Shared handles | clustered on 6 shared RIR contact/maintainer handles |
| Registry names | 2 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works · report an issue | |
Footprint over time
6 weekly snapshots · JSON
9
0 netblocks since 2026-07-05
2026-07-05
peak 9
2026-07-26
IP Ranges (9)
⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 168.168.244.0/22 | Marsh & McLennan Companies, Inc. | BGP | ANNOUNCED | ● high |
| 168.168.248.0/23 | Marsh & McLennan Companies, Inc. | BGP | ANNOUNCED | ● high |
| 168.168.252.0/22 | Marsh & McLennan Companies, Inc. | BGP | ANNOUNCED | ● high |
| 103.148.236.0/23 | Marsh & McLennan Companies, Inc. | APNIC | ASSIGNED PORTABLE | ● low |
| 168.168.128.0/17 | Marsh & McLennan Companies, Inc. | APNIC | ALLOCATED PORTABLE | ● low |
| 198.51.196.0/24 | Marsh & McLennan Companies, Inc. | APNIC | ASSIGNED PORTABLE | ● low |
| 203.4.128.0/22 | Marsh & McLennan Companies, Inc. | APNIC | ALLOCATED PORTABLE | ● low |
| 203.11.96.0/24 | Marsh & McLennan Companies, Inc. | APNIC | ASSIGNED PORTABLE | ● low |
| 2001:df2:fc80::/48 | Marsh & McLennan Companies, Inc. | APNIC | ASSIGNED PORTABLE | ● low |
IPv6 ranges (1)
| CIDR |
|---|
| 2001:df2:fc80::/48 |
Corporate group (5 confirmed entities)
- Marsh Inc. 70 blocks
- Marsh Ireland Brokers Limited 4 blocks
- Marsh & McLennan Inc 2 blocks
- William-M-Mercer-Ltd 1 blocks
Network trust
what's this?
RPKI hygiene: D
how networks compare →
44.4%
of checked blocks have valid RPKI ROA coverage
(4 of 9)
Possible discrepancies (1)
These blocks are registered to Marsh & McLennan Companies, 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.
| 103.148.236.0/23 /23 | authorized for AS19905 — Vercara, LLC |
NIC Handles
AM2769-AP
APNIC-HM
AS132481
MMCI1-AP
MMCI1-AP
ORG-MMCI1-AP