IPv4 prefix

203.6.0.0/17

IP Prefix (CIDR)

203.6.0.0/17

Subnet Mask

255.255.128.0

Address Count

32,768

IP Range

203.6.0.0 - 203.6.127.255

Subnet calculator

Calculate subnet details

Registered Owner

Owner

Australian Defence Organisation

Handle

ORG-ADO1-AP

Country

Australia (AU)

Address

Anzac Park West PO Box 7953

Registry

APNIC

Registered Prefixes

203.6.0.0/18 (203.6.0.0 - 203.6.63.255)
203.6.64.0/18 (203.6.64.0 - 203.6.127.255)

Delegated Prefix

203.6.0.0/17 (203.6.0.0 - 203.6.127.255)

BGP Announcements

Announced Prefix	Relationship	Origin ASN	Description	Country	First Address	Last Address
203.6.0.0/18	More specific	AS7474	SingTel Optus Pty Ltd	Australia (AU)	203.6.0.0	203.6.63.255
203.6.8.0/22	More specific	AS7575	Australian Academic and Research Network	Australia (AU)	203.6.8.0	203.6.11.255
203.6.31.0/24	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.31.0	203.6.31.255
203.6.32.0/23	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.32.0	203.6.33.255
203.6.36.0/22	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.36.0	203.6.39.255
203.6.64.0/20	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.64.0	203.6.79.255
203.6.66.0/24	More specific	AS209242	Cloudflare London LLC	United States of America (US)	203.6.66.0	203.6.66.255
203.6.74.0/24	More specific	AS209242	Cloudflare London LLC	United States of America (US)	203.6.74.0	203.6.74.255
203.6.100.0/22	More specific	AS18220	Australian Defence Organisation	Australia (AU)	203.6.100.0	203.6.103.255
203.6.104.0/22	More specific	AS18220	Australian Defence Organisation	Australia (AU)	203.6.104.0	203.6.107.255
203.6.114.0/24	More specific	AS18220	Australian Defence Organisation	Australia (AU)	203.6.114.0	203.6.114.255
203.6.118.0/23	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.118.0	203.6.119.255
203.6.120.0/23	More specific	AS9466	Verizon Japan Limited	Japan (JP)	203.6.120.0	203.6.121.255
203.6.127.0/24	More specific	AS1221	Telstra Limited	Australia (AU)	203.6.127.0	203.6.127.255