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

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From: NANOG <nanog-bounces+ops.lists=gmail.com@nanog.org> on behalf of Siyuan Miao <aveline@misaka.io>
Sent: Friday, July 23, 2021 12:38:16 PM
To: North American Network Operators' Group <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