Internet Routing Table Analysis Update. Philip Smith SANOG 9 Colombo, January 2007
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1 Internet Routing Table Analysis Update Philip Smith SANOG 9 Colombo, January 2007
2 Motivation 1998: No one was publishing any Internet routing table analysis Only CIDR-Report reporting on top 20 contributors to routing table, and top 20 bad aggregators With support of APNIC, my weekly reporting report started 23rd February 1999: Routing table size CIDR-Report style reporting on a per-rir basis and many other interesting features
3 Routing Report 22 January 2007 BGP routing table entries examined: Prefixes after maximum aggregation: Deaggregation factor: 1.85 Unique aggregates announced to Internet: Total ASes present in the Internet Routing Table: Origin-only ASes present in the Internet Routing Table: Origin ASes announcing only one prefix: Transit ASes present in the Internet Routing Table: 3117 Transit-only ASes present in the Internet Routing Table: 77 Average AS path length visible in the Internet Routing Table: 3.6 Max AS path length visible: 32 Max AS path prepend of ASN (20858) 18 Prefixes from unregistered ASNs in the Routing Table: 4 Unregistered ASNs in the Routing Table: 6 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 27 Number of addresses announced to Internet: Equivalent to 98 /8s, 250 /16s and 204 /24s Percentage of available address space announced: 44.8 Percentage of allocated address space announced: 63.6 Percentage of available address space allocated: 70.5 Total number of prefixes smaller than registry allocations:
4 APNIC Region Prefixes being announced by APNIC Region ASes: Total APNIC prefixes after maximum aggregation: APNIC Deaggregation factor: 2.48 Prefixes being announced from the APNIC address blocks: Unique aggregates announced from the APNIC address blocks: APNIC Region origin ASes present in the Internet Routing Table: 2827 APNIC Region origin ASes announcing only one prefix: 793 APNIC Region transit ASes present in the Internet Routing Table: 418 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 17 Number of APNIC addresses announced to Internet: Equivalent to 16 /8s, 114 /16s and 7 /24s Percentage of available APNIC address space announced: 86.3 APNIC AS Blocks , , , (pre-erx allocations) , APNIC Address Blocks 58/7, 60/7, 121/8, 122/7, 124/7, 126/8, 202/7 210/7, 218/7, 220/7 and 222/8
5 ARIN Region Prefixes being announced by ARIN Region ASes: Total ARIN prefixes after maximum aggregation: ARIN Deaggregation factor: 1.69 Prefixes being announced from the ARIN address blocks: Unique aggregates announced from the ARIN address blocks: ARIN Region origin ASes present in the Internet Routing Table: ARIN Region origin ASes announcing only one prefix: 4312 ARIN Region transit ASes present in the Internet Routing Table: 1038 Average ARIN Region AS path length visible: 3.4 Max ARIN Region AS path length visible: 21 Number of ARIN addresses announced to Internet: Equivalent to 18 /8s, 181 /16s and 7 /24s Percentage of available ARIN address space announced: 69.3 ARIN AS Blocks , , , (pre-erx allocations) , , , , , , , , , , , , , , , ARIN Address Blocks 24/8, 63/8, 64/5, 72/6, 76/8, 96/6, 199/8, 204/6, 208/7 and 216/8
6 RIPE NCC Region Prefixes being announced by RIPE Region ASes: Total RIPE prefixes after maximum aggregation: RIPE Deaggregation factor: 1.53 Prefixes being announced from the RIPE address blocks: Unique aggregates announced from the RIPE address blocks: RIPE Region origin ASes present in the Internet Routing Table: 9058 RIPE Region origin ASes announcing only one prefix: 4783 RIPE Region transit ASes present in the Internet Routing Table: 1463 Average RIPE Region AS path length visible: 4.0 Max RIPE Region AS path length visible: 32 Number of RIPE addresses announced to Internet: Equivalent to 17 /8s, 20 /16s and 170 /24s Percentage of available RIPE address space announced: 77.6 RIPE AS Blocks , 2043, 2047, , (pre-erx allocations) , , , , , , , , , , RIPE Address Blocks 62/8, 77/8, 78/7, 80/5, 88/6, 193/8, 194/7, 212/7 and 217/8
7 LACNIC Region Prefixes being announced by LACNIC Region ASes: Total LACNIC prefixes after maximum aggregation: 4023 LACNIC Deaggregation factor: 3.40 Prefixes being announced from the LACNIC address blocks: Unique aggregates announced from the LACNIC address blocks: 7206 LACNIC Region origin ASes present in the Internet Routing Table: 760 LACNIC Region origin ASes announcing only one prefix: 249 LACNIC Region transit ASes present in the Internet Routing Table: 135 Average LACNIC Region AS path length visible: 4.2 Max LACNIC Region AS path length visible: 20 Number of LACNIC addresses announced to Internet: Equivalent to 2 /8s, 41 /16s and 196 /24s Percentage of available LACNIC address space announced: 54.1 LACNIC AS Blocks , , plus ERX transfers LACNIC Address Blocks 189/8, 190/8, 200/7
8 AfriNIC Region Prefixes being announced by AfriNIC Region ASes: 2483 Total AfriNIC prefixes after maximum aggregation: 961 AfriNIC Deaggregation factor: 2.58 Prefixes being announced from the AfriNIC address blocks: 1772 Unique aggregates announced from the AfriNIC address blocks: 1150 AfriNIC Region origin ASes present in the Internet Routing Table: 174 AfriNIC Region origin ASes announcing only one prefix: 53 AfriNIC Region transit ASes present in the Internet Routing Table: 32 Average AfriNIC Region AS path length visible: 3.6 Max AfriNIC Region AS path length visible: 15 Number of AfriNIC addresses announced to Internet: Equivalent to 0 /8s, 81 /16s and 227 /24s Percentage of available AfriNIC address space announced: 16.0 AfriNIC AS Blocks & ERX transfers AfriNIC Address Blocks 41/8, 196/8
9 Global per AS prefix count summary ASN No of nets /20 equiv Max Agg Description AT&T WorldNet Services CHINANET-BACKBONE Videsh Sanchar Nigam Ltd. Aut AT&T Data Communications Serv Time Warner Telecom BellSouth Network Solutions, Sify Limited Covad Communications UUNET Technologies, Inc Cogent Communications BHARTI BT INTERNET LTD Cable One UniNet S.A. de C.V Sprint Verizon Global Networks Charter Communications Korea Telecom (MPLS) Korea Telecom (KIX) Citizens Utilities Cox Communications, Inc.
10 Global Aggregation Savings Summary ASN No of Nets Net Savings Description Videsh Sanchar Nigam Ltd. Aut Sify Limited CHINANET-BACKBONE Covad Communications Cable One BHARTI BT INTERNET LTD Time Warner Telecom Cox Communications, Inc UniNet S.A. de C.V Verizon Global Networks Hathway IP Over Cable Interne CenturyTel Internet Holdings, BellSouth Network Solutions, OLM LLC TPG Internet Pty Ltd Canadian Research Network Reliance Infocom Ltd Internet PaeTec.net -a division of Pae Instituto Costarricense de El Korea Telecom (KIX)
11 Number of prefixes announced by prefix length /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:19 /9:10 /10:13 /11:32 /12:117 /13:230 /14:412 /15:810 /16:9129 /17:3649 /18:5920 /19:12912 /20:14533 /21:12995 /22:16585 /23:17830 /24: /25:641 /26:463 /27:373 /28:66 /29:39 /30:90 /31:0 /32:33 January 2007 January 2006 Number of prefixes announced by prefix length /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:18 /9:5 /10:8 /11:20 /12:87 /13:196 /14:349 /15:680 /16:8655 /17:2967 /18:4979 /19:11209 /20:12377 /21:10691 /22:13696 /23:14912 /24:97275 /25:311 /26:252 /27:202 /28:62 /29:26 /30:55 /31:3 /32:39
12 Advertised IANA Reserved Addresses Network Origin AS Description / DLA Systems Automation Center / DLA Systems Automation Center / DLA Systems Automation Center / Australian Academic and Rease / Fraunhofer Gesellschaft / UUNET - Commercial IP service / National Research Council of / Digital United Inc / Digital United Inc / LANLINK autonomous system / NASA / DLA Systems Automation Center Private and Non-Routed Address Space Prefix Origin AS Description List of Unregistered AS's Bad AS Designation Network Transit AS Description PRIVATE / IX Europe Frankfurt
13 Prefixes Smaller than Registry Allocations ASN No of nets Total ann. Description Covad Communications BellSouth Network Solutions, AT&T WorldNet Services Sify Limited Cable One AT&T Data Communications Serv Time Warner Telecom OLM LLC Korea Telecom (KIX) Canadian Research Network CenturyTel Internet Holdings, Citizens Utilities UUNET - Commercial IP service Sprint BellSouth Network Solutions, Yipes Communications, Inc PaeTec.net -a division of Pae Rogers WAVE Cox Communications, Inc Choice One Communications Inc
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15 Growth slowed down
16 8 Mar /10 withdrawn
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24 Internet Routing Table Analysis Update Questions?
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