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 2020: ASN Name Fixed-By 7859 PAIR-NETWORKS 2020-12-13 20473 AS-CHOOPA 2020-12-16 25787 ROWE-NETWORKS 2020-12-23 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Dec 2020: ASN Name First-Spoofed Last-Spoofed 54825 PACKET 2016-04-15 2020-12-09 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2020-12-21 6128 CABLE-NET-1 2016-09-03 2020-12-06 20412 CLARITY-TELECOM 2016-09-30 2020-12-31 6181 FUSE-NET 2016-10-10 2020-12-31 14971 PINETEL 2016-10-21 2020-12-19 11427 TWC-11427-TEXAS 2016-10-21 2020-12-23 32440 LONI 2016-11-03 2020-12-21 12083 WOW-INTERNET 2016-11-09 2020-12-30 30036 MEDIACOM-ENTERPRISE-BUSINESS 2016-11-16 2020-12-21 63296 AWBROADBAND 2017-09-01 2020-12-29 12222 AKAMAI 2018-02-14 2020-12-23 393564 SPOKANE 2018-06-05 2020-12-15 33452 RW 2018-09-19 2020-12-29 20448 VPNTRANET-LLC 2018-09-20 2020-12-15 8047 GCI 2019-04-11 2020-12-18 7859 PAIR-NETWORKS 2020-04-03 2020-12-20 6391 URBAN-15 2020-05-29 2020-12-23 11814 DISTRIBUTEL-AS11814 2020-11-22 2020-12-18 208188 PUGET-SOUND-NETWORKS 2020-12-04 2020-12-19 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 Source Address Validation issues inferred during Dec 2020 using open resolver tests: ASN Name Last-Detected 16524 METTEL 2020-12-05 19257 SUBRIGO 2020-12-05 53274 3DB-WIRELESS 2020-12-04 395262 CENTRE-OF-EXCELLENCE-IN-NEXT-G 2020-12-04 11260 EASTLINK-HSI 2020-12-04 397081 AUWIRELESS-01 2020-12-04 53338 ITCI 2020-12-04 47023 NOR-NET-COMM 2020-12-04 40651 MONSTERGOVSOL 2020-12-04 32233 PERSONA 2020-12-03 394232 TELKEL-MTL 2020-12-03 46375 AS-SONICTELECOM 2020-12-03 9009 M247 2020-12-03 46328 FOUR-U 2020-12-03 15081 ASN-CROS-1 2020-12-02 16922 OUHSC-EDU 2020-12-02 29953 MORNCOMM 2020-12-02 396236 MIMOKC 2020-12-02 53456 WESTRUX 2020-12-01 11287 AS-MSEA 2020-12-01 4565 MEGAPATH2-US 2020-12-01 55175 CLOUDBURST 2020-12-01 395261 AS-HCCL-7 2020-12-01 25636 ONTL-2002 2020-12-01 30600 AS-CMN 2020-12-01 Further information for these tests is available at: https://spoofer.caida.org/ornog.php?country_include=usa,can Please send any feedback or suggestions to spoofer-info@caida.org