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 May 2024: ASN Name Fixed-By 34465 SPV 2024-05-31 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during May 2024: ASN Name First-Spoofed Last-Spoofed 207176 OPENFIBER 2022-09-30 2024-05-29 3920 IMS-RTFM 2023-10-06 2024-05-22 215845 2024-01-02 2024-05-29 206238 2024-05-06 2024-05-06 216014 2024-05-18 2024-05-18 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