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 Dec 2025: ASN Name Fixed-By 4901 CAAREN 2025-12-04 393397 LREC-LRT 2025-12-05 Further information for the inferred remediation is available at: https://spoofer.caida.org/remedy.php Source Address Validation issues inferred during Dec 2025: ASN Name First-Spoofed Last-Spoofed 7029 WINDSTREAM 2016-06-21 2025-12-06 32329 MONKEYBRAINS 2018-11-28 2025-12-04 22883 CONDENAST 2019-05-29 2025-12-10 21804 ACCESS-SK 2019-06-09 2025-12-28 36352 AS-COLOCROSSING 2020-10-08 2025-12-25 55016 IMPER-AS-1 2021-05-18 2025-12-27 22773 ASN-CXA-ALL-CCI-22773-RDC 2021-10-24 2025-12-18 12183 TALKIE-COMMUNICATIONS 2022-12-10 2025-12-26 400282 2023-04-27 2025-12-26 393577 SCCNET 2023-05-03 2025-12-25 394684 AS-GOLD 2024-01-17 2025-12-27 27425 ASN-IDK-27425 2024-02-21 2025-12-22 53755 IOFLOOD 2024-02-23 2025-12-26 393530 TLU 2024-05-22 2025-12-30 19935 CRRS 2024-05-29 2025-12-16 273143 2025-01-22 2025-12-27 54334 ROYA 2025-03-13 2025-12-29 273843 2025-04-02 2025-12-25 204969 AS_CIRTEL 2025-10-22 2025-12-07 22890 NCC-OMAHA 2025-12-06 2025-12-06 399728 PFOUNDATION 2025-12-10 2025-12-10 32425 SKB3-ARIN-BGP 2025-12-12 2025-12-12 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