Spoofing Information for AS 2497 (IIJ)

Spoofing status per IP block for last year of data

(Results for all dates also available.)
Spoof status key
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither spoofed nor unspoofed packet was received.
IP blockLatest testSpoof
49.239.65.x/242023-11-20 08:17:16 GMTrewrittenrewritten
49.239.66.x/242024-05-25 00:24:13 GMTrewrittenrewritten
49.239.67.x/242024-03-10 00:27:21 GMTrewrittenrewritten
49.239.72.x/242024-01-16 04:13:56 GMTrewrittenrewritten
125.30.1.x/242024-05-27 12:59:35 GMTblockedblocked
125.30.2.x/242024-03-18 03:35:26 GMTblockedblocked
125.30.3.x/242024-04-30 23:34:11 GMTblockedblocked
125.30.4.x/242023-12-30 03:17:48 GMTblockedblocked
125.30.48.x/242023-09-30 08:52:18 GMTblockedblocked
125.30.49.x/242023-08-05 08:00:07 GMTblockedblocked
125.30.50.x/242024-01-16 08:20:41 GMTblockedblocked
133.159.148.x/242023-10-06 17:01:26 GMTrewrittenrewritten
133.159.151.x/242024-03-08 04:52:54 GMTrewrittenrewritten
133.159.152.x/242023-10-10 08:05:38 GMTblockedblocked
150.31.26.x/242024-02-26 06:29:43 GMTblockedblocked
160.13.84.x/242024-01-29 03:07:29 GMTblockedblocked
160.13.102.x/242024-04-05 12:20:47 GMTblockedblocked
202.232.134.x/242023-12-20 00:56:41 GMTblockedblocked
210.138.178.x/242023-07-14 03:02:04 GMTblockedblocked
210.148.125.x/242023-07-14 14:35:45 GMTblockedblocked
220.156.12.x/242024-05-09 11:13:16 GMTrewrittenrewritten
220.156.14.x/242024-01-16 22:39:54 GMTrewrittenrewritten
2001:240:24xx::/402023-10-10 08:05:38 GMTblockedblocked

Customers of AS 2497 we have spoofer tests from

This is the list of directly connected customers of AS 2497 from which we have received a spoofer test, ordered by the customer's ability to send spoofed packets and the number of prefixes of an inferred ingress ACL derived from prefix announcements for the customer recorded in the latest month of public BGP data. BCP-84 describes ingress ACLs as "the most bulletproof solution when done properly" and the "best fit ... when the configuration is not too dynamic, ... if the number of used prefixes is low." Further detail about the size and dynamism of an inferred ACL is available by following the History link for each AS.

ASNCountryNumber of Prefixes
in Customer Cone
Number of ASes
in Customer Cone
55904 (KOGAKUIN-AS)jpn (Japan)20AS 55904 testsblocked
2527 (So-net)jpn (Japan)994AS 2527 testsblocked
17511 (OPTAGE)jpn (Japan)10210AS 17511 testsblocked
8674 (NETNOD-IX)swe (Sweden)13623AS 8674 testsblocked
55391 (MF-NATIVE6-E)jpn (Japan)1958AS 55391 testsblocked
2519 (VECTANT)jpn (Japan)1165123AS 2519 testsblocked
2907 (SINET-AS)jpn (Japan)2375209AS 2907 testsblocked

Address Space Announcement History

The customer cone for 2497 is too large for a prefix list to be useful.

Last Modified