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 2026: ASN Name Fixed-By 202585 bgp-rodeo 2026-09-08 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Sep 2026: ASN Name First-Spoofed Last-Spoofed 215605 Informatiq 2024-11-11 2026-09-30 215296 LOWPING-NL 2025-02-19 2026-09-24 35316 PRODACOM 2025-12-17 2026-09-29 60781 LEASEWEB-NL-AMS-01 2026-02-08 2026-09-26 58232 haderan 2026-04-04 2026-09-03 64289 MACARNE 2026-06-14 2026-09-30 214783 DEDICATEDNODES 2026-09-10 2026-09-24 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