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 2019: ASN Name Fixed-By 18451 LESNET 2019-10-10 16787 CHARTER-16787-DC 2019-10-14 19230 NANOG 2019-10-28 8047 GCI 2019-10-29 2037 CSUFRESNO 2019-10-30 3356 LEVEL3 2019-10-30 7018 ATT-INTERNET4 2019-10-31 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Oct 2019: ASN Name First-Spoofed Last-Spoofed 40065 CNSERVERS 2016-05-01 2019-10-09 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2019-10-30 6128 CABLE-NET-1 2016-09-03 2019-10-29 27364 ACS-INTERNET 2016-09-27 2019-10-03 20412 CLARITY-TELECOM 2016-09-30 2019-10-25 6181 FUSE-NET 2016-10-10 2019-10-28 25787 ROWE-NETWORKS 2016-10-21 2019-10-27 11427 TWC-11427-TEXAS 2016-10-21 2019-10-27 174 COGENT-174 2016-10-21 2019-10-28 11537 ABILENE 2016-10-24 2019-10-24 32440 LONI 2016-11-03 2019-10-28 12083 WOW-INTERNET 2016-11-09 2019-10-29 22561 CENTURYLINK-LEGACY-LIGHTCORE 2016-11-27 2019-10-08 701 UUNET 2017-06-14 2019-10-06 63296 AMARILLO-WIRELESS 2017-09-01 2019-10-28 546 PARSONS-PGS-1 2017-11-20 2019-10-24 12222 AKAMAI 2018-02-14 2019-10-18 4201 ORST 2018-04-19 2019-10-09 11827 WSU 2018-05-07 2019-10-25 225 VIRGINIA 2018-06-18 2019-10-31 33452 RW 2018-09-19 2019-10-30 20448 VPNTRANET-LLC 2018-09-20 2019-10-28 14031 SCXY 2018-10-18 2019-10-25 63275 RADIOWIRE 2019-02-07 2019-10-14 15290 ALLST-15290 2019-04-09 2019-10-02 8047 GCI 2019-04-11 2019-10-29 10745 ARIN-ASH-CHA 2019-04-29 2019-10-28 54600 PEGTECHINC 2019-08-28 2019-10-11 262248 Metro MPLS 2019-10-09 2019-10-09 46375 AS-SONICTELECOM 2019-10-21 2019-10-21 30136 AD12 2019-10-24 2019-10-24 396073 MAJESTIC-HOSTING-01 2019-10-30 2019-10-30 46300 HSC-WAP 2019-10-30 2019-10-30 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