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 Dec 2019: ASN Name Fixed-By 32 STANFORD 2019-12-11 19624 SERVERROOM 2019-12-28 62957 HOSPITALITY-NETWORK 2019-12-30 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Dec 2019: ASN Name First-Spoofed Last-Spoofed 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2019-12-27 6128 CABLE-NET-1 2016-09-03 2019-12-29 20412 CLARITY-TELECOM 2016-09-30 2019-12-31 20001 TWC-20001-PACWEST 2016-10-08 2019-12-06 6181 FUSE-NET 2016-10-10 2019-12-31 174 COGENT-174 2016-10-21 2019-12-31 32440 LONI 2016-11-03 2019-12-27 12083 WOW-INTERNET 2016-11-09 2019-12-31 9009 M247 2017-01-10 2019-12-30 701 UUNET 2017-06-14 2019-12-24 63296 AMARILLO-WIRELESS 2017-09-01 2019-12-31 546 PARSONS-PGS-1 2017-11-20 2019-12-30 12222 AKAMAI 2018-02-14 2019-12-31 11827 WSU 2018-05-07 2019-12-13 393564 SPOKANE 2018-06-05 2019-12-31 225 VIRGINIA 2018-06-18 2019-12-17 33452 RW 2018-09-19 2019-12-02 20448 VPNTRANET-LLC 2018-09-20 2019-12-30 63275 RADIOWIRE 2019-02-07 2019-12-09 19531 NODESDIRECT 2019-03-14 2019-12-17 8047 GCI 2019-04-11 2019-12-31 10745 ARIN-ASH-CHA 2019-04-29 2019-12-12 46573 GLOBAL-FRAG-NETWORKS 2019-05-16 2019-12-14 29933 OFF-CAMPUS-TELECOMMUNICATIONS 2019-07-15 2019-12-30 54600 PEGTECHINC 2019-08-28 2019-12-18 46300 HSC-WAP 2019-10-30 2019-12-26 2886 EC-813-2886 2019-11-05 2019-12-31 63018 USDEDICATED 2019-12-03 2019-12-06 21859 ZNET 2019-12-26 2019-12-26 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