IPv4 prefix

51.4.0.0/15

IP Prefix (CIDR)

51.4.0.0/15

Subnet Mask

255.254.0.0

Address Count

131,072

IP Range

51.4.0.0 - 51.5.255.255

Subnet calculator

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Registered Owner

Handle

MICROSOFT-MAINT

Country

Israel (IL)

Registry

RIPENCC

Registered Prefixes

51.4.0.0/16 (51.4.0.0 - 51.4.255.255)
51.5.0.0/16 (51.5.0.0 - 51.5.255.255)

Delegated Prefix

51.4.0.0/15 (51.4.0.0 - 51.5.255.255)

BGP Announcements

Announced Prefix	Relationship	Origin ASN	Description	Country	First Address	Last Address
51.4.0.0/15	Exact	AS8075	Microsoft Corporation	United States of America (US)	51.4.0.0	51.5.255.255