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 usa, can. Inferred improvements during Oct 2023: ASN Name Fixed-By 10796 TWC-10796-MIDWEST 2023-10-19 23483 SHASTACOE 2023-10-19 11878 TZULO 2023-10-24 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 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2023-10-26 20412 CLARITY-TELECOM 2016-09-30 2023-10-31 25787 ROWE-NETWORKS 2016-10-21 2023-10-29 11427 TWC-11427-TEXAS 2016-10-21 2023-10-09 271 BCNET 2016-10-24 2023-10-29 6461 ZAYO-6461 2017-06-21 2023-10-11 14031 SCXY 2018-10-18 2023-10-24 55016 IMPER-AS-1 2021-05-18 2023-10-14 46997 2021-12-22 2023-10-26 394414 E2WS 2022-05-08 2023-10-26 400517 2022-10-03 2023-10-08 12183 TALKIE-COMMUNICATIONS 2022-12-10 2023-10-31 3701 NERONET 2023-04-18 2023-10-26 400282 2023-04-27 2023-10-27 46690 SNET-FCC 2023-05-20 2023-10-28 36687 WILINE 2023-08-02 2023-10-10 394660 CHOICETEL-ER 2023-10-07 2023-10-07 19126 KIZAWIRELESS 2023-10-16 2023-10-24 18526 2023-10-17 2023-10-17 393899 RWLV 2023-10-17 2023-10-17 20119 ARROW 2023-10-19 2023-10-21 23483 SHASTACOE 2023-10-19 2023-10-19 12129 123NET 2023-10-20 2023-10-20 Further information for these tests where we received spoofed packets is available at: https://spoofer.caida.org/recent_tests.php?country_include=usa,can&no_block=1 Please send any feedback or suggestions to spoofer-info@caida.org