I noticed something interesting the other day... /24's seem to be contributing to the majority of the internet routing table today. Here is the breakdown right now as viewed through GlobalCrossing transit (the view is consistent from many other sources): Length /8: 23 Length /9: 4 Length /10: 5 Length /11: 10 Length /12: 32 Length /13: 59 Length /14: 194 Length /15: 304 Length /16: 6751 Length /17: 1003 Length /18: 2017 Length /19: 6275 Length /20: 4451 Length /21: 4316 Length /22: 6457 Length /23: 8429 Length /24: 58763 Length /25: 224 Length /26: 351 I was rather shocked by the number of /24's so I ran some further stats. Here is the top 25 offenders by origin AS: ASN: 701 routes: 1906 UUNet ASN: 1221 routes: 1775 ?????? ASN: 1 routes: 606 BBN Planet ASN: 2711 routes: 603 Rock Hill Telephone Company ASN: 7018 routes: 599 AT&T ASN: 7046 routes: 587 UUNet ASN: 1785 routes: 546 Applied Theory ASN: 705 routes: 537 UUNet ASN: 174 routes: 508 PSInet ASN: 8013 routes: 494 PSINet Canada ASN: 2551 routes: 463 ICG NetAhead ASN: 1239 routes: 453 Sprint ASN: 3561 routes: 365 Cable and Wireless ASN: 4293 routes: 355 Cable and Wireless ASN: 2548 routes: 346 Digex ASN: 2764 routes: 337 connect.com.au ASN: 3602 routes: 313 Sprint Canada ASN: 703 routes: 299 UUNet (Asia) ASN: 209 routes: 292 Qwest ASN: 2914 routes: 291 Verio ASN: 3301 routes: 271 RIPE ASN: 577 routes: 268 Bell Canada ASN: 3908 routes: 261 Supernet, Inc. ASN: 271 routes: 261 University of British Columbia ASN: 724 routes: 258 DLA Systems Automation Center Most of this waste seems to be coming from the Tier 2's, and for some reason a large number of people doing things like 100/24, 102/24, 104/24, etc, out of their larger netblocks. So here is a list considering the entire AS path (note I can't give an accurate number for gblx), which indicates those transiting the biggest offenders: ASN: 701 routes: 17867 UUNet ASN: 3967 routes: 8170 Exodus Communications ASN: 10910 routes: 5948 InterNap ASN: 1239 routes: 4967 Sprint ASN: 3561 routes: 3095 Cable and Wireless ASN: 209 routes: 3061 Qwest ASN: 6461 routes: 2383 AboveNet Communications ASN: 174 routes: 2347 PSInet ASN: 1221 routes: 2343 ?????? ASN: 7018 routes: 2260 AT&T ASN: 6453 routes: 2014 Teleglobe ASN: 4355 routes: 1894 EarthLink ASN: 702 routes: 1617 UUNet (Europe) ASN: 5511 routes: 1480 Europe ASN: 2548 routes: 1403 Digex ASN: 1 routes: 1101 BBN Planet ASN: 703 routes: 1095 UUNet (Asia) ASN: 577 routes: 862 Bell Canada ASN: 2711 routes: 814 TRW Huntsville ASN: 2914 routes: 785 Verio ASN: 3356 routes: 755 Level 3 Communications ASN: 6347 routes: 717 SAVVIS Communications ASN: 1785 routes: 715 Applied Theory ASN: 7474 routes: 661 APNIC ASN: 690 routes: 653 Merit Network <-- bad merit, bad ASN: 7046 routes: 588 UUNet ASN: 4000 routes: 564 Sprint International ASN: 8297 routes: 560 Europe ASN: 4648 routes: 546 APNIC ASN: 705 routes: 537 UUNet ASN: 2828 routes: 506 Concentric ASN: 8013 routes: 497 PSINet Canada ASN: 3908 routes: 483 Supernet, Inc. ASN: 724 routes: 476 DLA Systems Automation Center ASN: 2551 routes: 472 ICG NetAhead ASN: 286 routes: 457 EUNet ASN: 4565 routes: 456 Epoch Networks ASN: 7473 routes: 438 APNIC ASN: 5650 routes: 438 Electric Lightwave ASN: 2764 routes: 430 connect.com.au ASN: 1913 routes: 409 Defense Logistics Agency ASN: 3602 routes: 408 Sprint Canada ASN: 2685 routes: 403 IBM ASN: 816 routes: 401 UUNet Canada BTW who is AS 1221? That block is listed as allocated by ARIN, but ARIN has nothing in the whois for them. I can produce a full list if anyone is interested. I'll see if I can get a more accurate view for the aspath stats as well. -- Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/ras PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)