Robert Half International Inc. — IP ranges & network footprint

IP Ranges (4)

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CIDR	Org name	Registry	Status	Confidence
81.145.27.96/28	ROBERT-HALF	RIPE	ASSIGNED PA	● low
204.75.64.0/18	Robert Half International, Inc.	ARIN	DIRECT ALLOCATION	● low
2a00:2381:1708::/48	ROBERT-HALF	RIPE	AGGREGATED-BY-LIR	● low
2a00:2381:1708:100::/56	ROBERT-HALF	RIPE	ASSIGNED	● low

Possibly related to this organisation

what's this?

Same name family

Separately-registered clusters whose names share “Robert Half” — 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.

ROBERT-HALF-NETS 20 blocks
ROBERT-HALF-LIMITED 16 blocks
ROBERT-HALF-FRANKFURT-AM-MAIN-NET 2 blocks
ROBERT-HALF-DEUTSCHLAND-BERLIN-NET 2 blocks
ROBERT-HALF-STUTTGART-NET 2 blocks
ROBERT-HALF-MANNHEIM-NET 2 blocks
ROBERT-HALF-BELGIUM-NET 1 blocks
ROBERT-HALF-DUESSELDORF-NET 1 blocks

Combined view of all 13 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.

Robert-Half-Int-NET sub-allocation
robert_half_personnel_uk via British Telecommunications Limited sub-allocation
Robert-Half-International-Indirect-LAN sub-allocation
ROBERTHALFGMBH via Vodafone Group PLC sub-allocation
ROBERT-HALF-BELGIUM-NET sub-allocation
Robert Half Deutschland Gmbh Co Kg via COLT Technology Services Group Limited sub-allocation
ROBERT-HALF-MUENCHEN-NET via Deutsche Telekom AG sub-allocation
ROBERT-HALF-DUESSELDORF-NET via Deutsche Telekom AG sub-allocation

Network trust

what's this?

RPKI hygiene: C how networks compare →

75.0% of checked blocks have valid RPKI ROA coverage (3 of 4)

Possible discrepancies (2)

These blocks are registered to Robert Half International, 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.

2a00:2381:1708::/48 /48	authorized for AS2856 — British Telecommunications Limited
2a00:2381:1708:100::/56 /56	authorized for AS2856 — British Telecommunications Limited

NIC Handles

BTNET-MNT DUMY-RIPE DUMY-RIPE NETWO8932-ARIN NETWO8932-ARIN RHI TAP18-ARIN TAP18-ARIN TAP18-ARIN

Netblocks	4 · 16,398 IPv4 addresses
All fragments	54 blocks across 13 clusters
Cluster ID	215294600
Registry	ARIN
Owner jurisdiction	US-DE
Customers	find customers using this network →

Attribution	GLEIF legal-entity match
Legal identity	LEI 529900VPCUY9H3HLIC08
Shared handles	clustered on 9 shared RIR contact/maintainer handles
Registry names	2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works