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 Jan 2020: ASN Name Fixed-By 701 UUNET 2020-01-15 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Jan 2020: ASN Name First-Spoofed Last-Spoofed 5650 FRONTIER-FRTR 2016-02-22 2020-01-10 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2020-01-30 6128 CABLE-NET-1 2016-09-03 2020-01-29 20412 CLARITY-TELECOM 2016-09-30 2020-01-30 20001 TWC-20001-PACWEST 2016-10-08 2020-01-31 6181 FUSE-NET 2016-10-10 2020-01-29 174 COGENT-174 2016-10-21 2020-01-29 32440 LONI 2016-11-03 2020-01-25 12083 WOW-INTERNET 2016-11-09 2020-01-30 39939 RISE-CO-AS39939 2016-11-11 2020-01-27 9009 M247 2017-01-10 2020-01-31 701 UUNET 2017-06-14 2020-01-16 63296 AMARILLO-WIRELESS 2017-09-01 2020-01-28 18798 ENCORE-ASN 2017-10-09 2020-01-11 546 PARSONS-PGS-1 2017-11-20 2020-01-30 12222 AKAMAI 2018-02-14 2020-01-30 11827 WSU 2018-05-07 2020-01-30 393564 SPOKANE 2018-06-05 2020-01-28 225 VIRGINIA 2018-06-18 2020-01-22 20448 VPNTRANET-LLC 2018-09-20 2020-01-28 3549 LVLT-3549 2018-12-06 2020-01-28 62957 HOSPITALITY-NETWORK 2018-12-30 2020-01-10 23523 VOYAGEURINTERNET-1 2019-01-22 2020-01-06 63275 RADIOWIRE 2019-02-07 2020-01-15 6360 UNIVHAWAII 2019-02-25 2020-01-18 11297 LIPSCOMB 2019-03-29 2020-01-21 8047 GCI 2019-04-11 2020-01-29 46300 HSC-WAP 2019-10-30 2020-01-30 2886 EC-813-2886 2019-11-05 2020-01-10 63018 USDEDICATED 2019-12-03 2020-01-31 19009 ONECLEVELAND 2020-01-07 2020-01-07 12231 CONWAYCORP 2020-01-10 2020-01-31 239 UTORONTO 2020-01-28 2020-01-28 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