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 2018: ASN Name Fixed-By 11232 MIDCO-NET 2018-05-14 11796 AIRSTREAMCOMM-NET 2018-05-22 577 BACOM 2018-05-25 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during May 2018: ASN Name First-Spoofed Last-Spoofed 3356 LEVEL3 2016-03-06 2018-05-15 577 BACOM 2016-03-09 2018-05-17 7922 COMCAST-7922 2016-06-04 2018-05-14 7029 WINDSTREAM 2016-06-21 2018-05-09 2828 XO-AS15 2016-07-27 2018-05-30 209 CENTURYLINK-US-LEGACY-QWEST 2016-08-16 2018-05-31 6128 CABLE-NET-1 2016-09-03 2018-05-26 20412 CLARITY-TELECOM 2016-09-30 2018-05-30 20001 ROADRUNNER-WEST 2016-10-08 2018-05-09 6181 FUSE-NET 2016-10-10 2018-05-31 15305 SYRINGANETWORKS 2016-10-21 2018-05-16 25787 ROWE-NETWORKS 2016-10-21 2018-05-28 11427 SCRR-11427 2016-10-21 2018-05-19 174 COGENT-174 2016-10-21 2018-05-29 271 BCNET 2016-10-24 2018-05-30 20082 ABSNOC1 2016-10-27 2018-05-02 32440 LONI 2016-11-03 2018-05-31 33182 DimeNOC 2016-11-08 2018-05-30 12083 WOW-INTERNET 2016-11-09 2018-05-31 5056 AUREON-5056 2016-11-10 2018-05-30 1403 EBOX 2016-11-12 2018-05-26 20105 URICHMOND 2016-11-15 2018-05-29 54858 AS-SBI 2016-12-25 2018-05-23 2152 CSUNET-NW 2017-02-02 2018-05-31 21832 KELLINCOM-1 2017-02-03 2018-05-30 18451 LESNET 2017-02-22 2018-05-03 7122 MTS-ASN 2017-05-16 2018-05-19 6461 ZAYO-6461 2017-06-21 2018-05-16 26253 SCINTERNET 2017-06-30 2018-05-31 26793 ICS-LLC 2017-08-16 2018-05-03 63296 AMARILLO-WIRELESS 2017-09-01 2018-05-30 7233 YAHOO-US 2017-09-07 2018-05-31 33523 ROWANUNIVERSITY 2017-10-29 2018-05-12 546 PARSONS-PGS-1 2017-11-20 2018-05-07 54540 INCERO 2018-01-15 2018-05-30 12222 AKAMAI 2018-02-14 2018-05-28 55236 CBC 2018-03-03 2018-05-24 3257 GTT-BACKBONE 2018-03-06 2018-05-28 29384 Qatar-Foundation 2018-03-08 2018-05-28 23148 TERRENAP 2018-03-15 2018-05-30 226 LOS-NETTOS 2018-03-26 2018-05-29 15176 AS-INOC 2018-04-09 2018-05-16 20009 WADSNET 2018-04-13 2018-05-30 4201 ORST 2018-04-19 2018-05-30 11827 WSU 2018-04-19 2018-05-31 31863 DACEN-2 2018-04-26 2018-05-04 15301 IOVATION 2018-05-02 2018-05-03 19016 WCG 2018-05-19 2018-05-19 122 U-PGH-NET 2018-05-19 2018-05-19 21949 BEANFIELD 2018-05-21 2018-05-21 40764 DNA-DKLB 2018-05-29 2018-05-29 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