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 nld. Inferred improvements during Sep 2019: none inferred Source Address Validation issues inferred during Sep 2019: ASN Name First-Spoofed Last-Spoofed 28685 ASN-ROUTIT 2017-03-26 2019-09-12 12222 AKAMAI 2018-02-14 2019-09-12 28878 SIGNET 2018-06-27 2019-09-24 33915 TNF 2019-01-28 2019-09-09 1136 KPN 2019-09-04 2019-09-04 8455 ATOM86 2019-09-12 2019-09-12 209280 SmartHosten 2019-09-27 2019-09-27 Further information for these tests where we received spoofed packets is available at: https://spoofer.caida.org/recent_tests.php?country_include=nld&no_block=1 Please send any feedback or suggestions to spoofer-info@caida.org