Equinix renumber the IP Block from a /24 to a /23 and everyone was suppose to be off the old block I think around a year ago. I am sure some providers did not migrate everything off that IP Block. Everyone that was a member at that time was given a new IP Address on the /23 subnet, I believe the last octet of the address stayed the same. They might just be emailing of an old email template for peering. Also, Here is that peers new IP block assuming it's AS19016. 208.115.136.119 0 19016 853824 755885 382498487 0 0 8w5d 20 Erik ________________________________ From: NANOG <nanog-bounces@nanog.org> on behalf of JASON BOTHE via NANOG <nanog@nanog.org> Sent: Tuesday, October 8, 2019 1:57 PM To: James Cornman <james@atlanticmetro.net> Cc: nanog@nanog.org <nanog@nanog.org> Subject: Re: Chicago Equinix IX LAN oddity Got it, thanks for that. I’ll have to give the big E a call and see how to sort this one out. J~ On Oct 8, 2019, at 13:55, James Cornman <james@atlanticmetro.net> wrote:  There was a subnet expansion/migration there earlier this year (maybe late last year?) We have an old and new address on our interface.. The 208.x is the new range (aka bigger) ip address 206.223.119.124/24<http://206.223.119.124/24> ip address 208.115.136.124/23<http://208.115.136.124/23> -James On Tue, Oct 8, 2019 at 2:47 PM JASON BOTHE via NANOG <nanog@nanog.org<mailto:nanog@nanog.org>> wrote: Hi all I realize this might not be the right list but I have a request to peer on the Chicago Equinix IX to a 206.223.119 IP but we and many others are on the 208.115.137 network. While I await a response from the peering partner, I’d curious to know if this is an error, perhaps there was a renumber at one time or I’m flat out just missing something. Cheers! J~ -- James Cornman jcornman@atlanticmetro.net<mailto:jcornman@atlanticmetro.net> 212.792.9950 Atlantic Metro Communications 4 Century Drive, Parsippany NJ 07054 Cloud Hosting • Colocation • Network Connectivity • Managed Services Follow us on Twitter: @atlanticmetro<https://twitter.com/atlanticmetro> • Like us on Facebook<https://www.facebook.com/atlanticmetro> www.atlanticmetro.net<https://www.atlanticmetro.net/> ________________________________ CONFIDENTIALITY NOTICE: This e-mail transmission, and any documents, files or previous e-mail messages attached to it may contain confidential information that is legally privileged. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of any of the information contained in or attached to this transmission is STRICTLY PROHIBITED. If you have received this transmission in error please notify the sender immediately by replying to this e-mail. You must destroy the original transmission and its attachments without reading or saving in any manner. Thank you.