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 2021: ASN Name Fixed-By 399804 2021-10-01 212934 AS_POTVIN 2021-10-08 398355 DATAIDEAS-LLC 2021-10-22 21976 NJEDGE-NET 2021-10-26 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Oct 2021: ASN Name First-Spoofed Last-Spoofed 577 BACOM 2016-03-09 2021-10-29 19230 NANOG 2016-06-13 2021-10-31 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2021-10-27 6128 CABLE-NET-1 2016-09-03 2021-10-17 20412 CLARITY-TELECOM 2016-09-30 2021-10-30 6181 FUSE-NET 2016-10-10 2021-10-29 11427 TWC-11427-TEXAS 2016-10-21 2021-10-21 32440 LONI 2016-11-03 2021-10-31 22898 ATLINK 2016-12-16 2021-10-31 63296 AWBROADBAND 2017-09-01 2021-10-25 12222 AKAMAI 2018-02-14 2021-10-31 393564 SPOKANE 2018-06-05 2021-10-26 33452 RW 2018-09-19 2021-10-19 14031 SCXY 2018-10-18 2021-10-27 62904 EONIX-COMMUNICATIONS-ASBLOCK-6 2019-07-14 2021-10-26 53356 FREE RANGE CLOUD 2020-05-19 2021-10-22 395723 LIGHTSPEEDHOSTING1 2020-06-22 2021-10-20 56207 Converge 2021-03-26 2021-10-27 399318 2021-08-29 2021-10-31 63457 EMPIRE-CONNECT 2021-09-08 2021-10-28 33258 CSONLINE-AS-1 2021-09-28 2021-10-27 212934 AS_POTVIN 2021-10-03 2021-10-31 396503 WESTCONNECT-COMMUNICATIONS 2021-10-22 2021-10-22 22773 ASN-CXA-ALL-CCI-22773-RDC 2021-10-24 2021-10-31 26231 SFIA-ASN 2021-10-27 2021-10-27 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