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 Mar 2020: ASN Name Fixed-By 9009 M247 2020-03-04 6830 LGI-UPC 2020-03-22 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Mar 2020: ASN Name First-Spoofed Last-Spoofed 31400 ACCELERATED-IT 2016-02-18 2020-03-12 9009 M247 2017-01-10 2020-03-24 1136 KPN 2019-09-04 2020-03-03 8587 Infracom 2019-10-28 2020-03-12 209299 VITOX-TELECOM 2019-12-15 2020-03-10 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