In response to feedback from operational security communities, CAIDA's source address validation measurement project (https://spoofer.caida.org) is automatically generating monthly reports of ASes originating prefixes in BGP for systems from which we received packets with a spoofed source address. We are publishing these reports to network and security operations lists in order to ensure this information reaches operational contacts in these ASes. This report summarises tests conducted within nld. Inferred improvements during Oct 2023: ASN Name Fixed-By 207176 OPENFIBER 2023-10-05 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Oct 2023: ASN Name First-Spoofed Last-Spoofed 14576 HOSTING-SOLUTIONS 2016-11-20 2023-10-09 20847 PREVIDER 2018-04-17 2023-10-31 1136 KPN 2019-09-04 2023-10-18 8587 Infracom 2019-10-28 2023-10-17 213371 2020-07-02 2023-10-24 213268 2020-12-07 2023-10-29 207176 OPENFIBER 2022-09-30 2023-10-31 28685 ASN-ROUTIT 2023-08-23 2023-10-30 212370 2023-09-14 2023-10-12 3920 IMS-RTFM 2023-10-06 2023-10-24 211826 2023-10-19 2023-10-24 60528 ASN-XANTOS 2023-10-31 2023-10-31 Further information for these tests where we received spoofed packets is available at: https://spoofer.caida.org/recent_tests.php?country_include=nld&no_block=1 Please send any feedback or suggestions to spoofer-info@caida.org