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Youtube had previously registered the CIDR block 208.65.152.0/22 that contains the IP addresses 208.65.152.0 - 208.65.155.255

Pakistan then registered the CIDR block 208.65.153.0/24 that contains the IP addresses 208.65.153.0 - 208.65.153.255.

Due to the longer prefix, Youtube traffic was thus directed to Pakistan however what about the IP addresses 208.65.152.0-208.65.152.255 that is not contained in Pakistan's newly registered CIDR? Was traffic still delivered there? #confused

Would appreciate clarification here! Thanks

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  • I have found information stating that Youtube's DNS and Web Servers were contained in 208.65.153.0/24 (208.65.153.0-208.65.153.255) which falls within Pakistan's CIDR block. So could the other 256 IP addresses that do not fall within this block be internal unreachable addresses?
    – ellefc
    Commented Apr 1, 2016 at 20:04
  • This question has nothing to do with a professional network under your control. You will need to ask Google about this.
    – Ron Maupin
    Commented Apr 1, 2016 at 20:20

1 Answer 1

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The most specific route is preferred. 24 is longer ("more specific") than 22, so it will be used. If they announced only one /24, then they only took over that one /24 out of the larger /22.

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