It's ASN, not IPv4 prefix. From: NANOG <nanog-bounces+david=xtom.com@nanog.org> On Behalf Of Suresh Ramasubramanian Sent: Friday, July 23, 2021 3:21 PM To: Siyuan Miao <aveline@misaka.io>; North American Network Operators' Group <nanog@nanog.org> Subject: Re: Spamhaus ASN-DROP list This is probably an ex afrinic stolen block? In which case it's for afrinic to sort out and reclaim --srs ________________________________ From: NANOG <nanog-bounces+ops.lists=gmail.com@nanog.org<mailto:nanog-bounces+ops.lists=gmail.com@nanog.org>> on behalf of Siyuan Miao <aveline@misaka.io<mailto:aveline@misaka.io>> Sent: Friday, July 23, 2021 12:38:16 PM To: North American Network Operators' Group <nanog@nanog.org<mailto:nanog@nanog.org>> Subject: Spamhaus ASN-DROP list Hi All, One of our ASNs has been listed in the Spamhaus ASN-DROP list before it was assigned to us. We emailed them last year but didn't get a response. Could anyone from Spamhaus contact us off the list? Best Regards, Siyuan