McGraw-Hill Ryerson
Data as of 2026-10-18
BGP inherited
Limited data: only 3 ranges found registered
under this exact name. This may not reflect the organisation's full internet footprint — many companies'
web and cloud infrastructure is hosted under a third-party provider's own registration rather than their own.
This organisation
| Netblocks | 3 · 4,864 IPv4 addresses |
| IPv6 | 1 prefix (largest 2a00:2381:e1ce::/48) |
| Record ID | 250711867 |
| Registry | ARIN |
| Customers | see who runs inside this network → |
Evidence & provenance ?
| Attribution | BGP parent (inherited) |
| Shared handles | clustered on 12 shared RIR contact/maintainer handles |
| Registry names | 3 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works · report an issue | |
IP Ranges (3)
⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 192.243.80.0/20 | McGraw-Hill Education | ARIN | DIRECT ALLOCATION | ● high |
| 199.166.216.0 – 199.166.218.255 | McGraw-Hill Ryerson | ARIN | DIRECT ALLOCATION | ● high |
| 2a00:2381:e1ce::/48 | MCGRAW-HILL | RIPE | AGGREGATED-BY-LIR | ● low |
IPv6 ranges (1)
| CIDR |
|---|
| 2a00:2381:e1ce::/48 |
Other domains hosted in this network
what's this?Network trust
what's this?
RPKI hygiene: D
how networks compare →
33.3%
of checked blocks have valid RPKI ROA coverage
(1 of 3)
Possible discrepancies (1)
These blocks are registered to McGraw-Hill Ryerson 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:e1ce::/48 /48 | authorized for AS2856 — British Telecommunications Limited |
NIC Handles
BTNET-MNT
DUMY-RIPE
DUMY-RIPE
JDT8-ARIN
KONUJ1-ARIN
MAOC-ARIN
MCGRAW-1
MGEHL
MHENE-ARIN
MNOC10-ARIN
WANGA38-ARIN
WANGA38-ARIN