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 Mar 2020: ASN Name Fixed-By 6128 CABLE-NET-1 2020-03-02 11827 WSU 2020-03-03 32329 MONKEYBRAINS 2020-03-04 11427 TWC-11427-TEXAS 2020-03-26 11525 HRTC 2020-03-26 396073 MAJESTIC-HOSTING-01 2020-03-31 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Mar 2020: ASN Name First-Spoofed Last-Spoofed 577 BACOM 2016-03-09 2020-03-12 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2020-03-25 6128 CABLE-NET-1 2016-09-03 2020-03-30 7459 GRANDECOM-AS1 2016-09-26 2020-03-26 20412 CLARITY-TELECOM 2016-09-30 2020-03-28 6181 FUSE-NET 2016-10-10 2020-03-31 11427 TWC-11427-TEXAS 2016-10-21 2020-03-07 174 COGENT-174 2016-10-21 2020-03-31 32440 LONI 2016-11-03 2020-03-28 12083 WOW-INTERNET 2016-11-09 2020-03-31 39939 RISE-CO-AS39939 2016-11-11 2020-03-02 1403 EBOX 2016-11-12 2020-03-09 701 UUNET 2017-06-14 2020-03-17 6461 ZAYO-6461 2017-06-21 2020-03-04 63296 AWBROADBAND 2017-09-01 2020-03-31 546 PARSONS-PGS-1 2017-11-20 2020-03-26 12222 AKAMAI 2018-02-14 2020-03-15 393564 SPOKANE 2018-06-05 2020-03-10 20448 VPNTRANET-LLC 2018-09-20 2020-03-23 63275 RADIOWIRE 2019-02-07 2020-03-11 8047 GCI 2019-04-11 2020-03-25 46300 HSC-WAP 2019-10-30 2020-03-26 2886 EC-813-2886 2019-11-05 2020-03-25 21859 ZNET 2019-12-26 2020-03-25 12231 CONWAYCORP 2020-01-10 2020-03-26 239 UTORONTO 2020-01-28 2020-03-28 13614 ALLWEST 2020-03-16 2020-03-24 51043 ASPIRE01 2020-03-17 2020-03-17 26335 MTSU 2020-03-20 2020-03-20 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