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 May 2019: ASN Name Fixed-By 7922 COMCAST-7922 2019-05-07 6939 HURRICANE 2019-05-14 22773 ASN-CXA-ALL-CCI-22773-RDC 2019-05-20 10965 MRNET 2019-05-30 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during May 2019: ASN Name First-Spoofed Last-Spoofed 6939 HURRICANE 2016-02-22 2019-05-29 54825 PACKET 2016-04-15 2019-05-03 7029 WINDSTREAM 2016-06-21 2019-05-19 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2019-05-28 6128 CABLE-NET-1 2016-09-03 2019-05-24 20412 CLARITY-TELECOM 2016-09-30 2019-05-27 6181 FUSE-NET 2016-10-10 2019-05-31 25787 ROWE-NETWORKS 2016-10-21 2019-05-25 174 COGENT-174 2016-10-21 2019-05-30 30341 SCTA-ASN 2016-10-31 2019-05-21 32440 LONI 2016-11-03 2019-05-30 12083 WOW-INTERNET 2016-11-09 2019-05-31 13427 SOFTCOM-INTERNET-COMMUNICATION 2016-11-14 2019-05-15 21832 KELLINCOM-1 2017-02-03 2019-05-29 18451 LESNET 2017-02-22 2019-05-14 701 UUNET 2017-06-14 2019-05-27 63296 AMARILLO-WIRELESS 2017-09-01 2019-05-30 33523 ROWANUNIVERSITY 2017-10-29 2019-05-09 546 PARSONS-PGS-1 2017-11-20 2019-05-18 12222 AKAMAI 2018-02-14 2019-05-10 4201 ORST 2018-04-19 2019-05-29 19016 WCG 2018-05-19 2019-05-17 225 VIRGINIA 2018-06-18 2019-05-15 40911 L2NC 2018-08-31 2019-05-12 33452 RW 2018-09-19 2019-05-30 20448 VPNTRANET-LLC 2018-09-20 2019-05-28 63275 RADIOWIRE 2019-02-07 2019-05-30 10965 MRNET 2019-02-11 2019-05-30 19531 NODESDIRECT 2019-03-14 2019-05-16 8047 GCI 2019-04-11 2019-05-30 10745 ARIN-ASH-CHA 2019-04-29 2019-05-31 20381 CABLELABS 2019-05-01 2019-05-01 393457 HUC-3 2019-05-02 2019-05-02 6058 NORTHWESTEL-INC 2019-05-06 2019-05-25 6536 CITYNET 2019-05-15 2019-05-15 46573 AS-GLobalf 2019-05-16 2019-05-18 138576 2019-05-21 2019-05-28 395148 PACLW 2019-05-27 2019-05-27 22883 CONDENAST 2019-05-29 2019-05-29 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