The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Monday, January 17, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Tue 18 Jan, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 341668
Prefixes after maximum aggregation: 154502
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 168705
Total ASes present in the Internet Routing Table: 35652
Prefixes per ASN: 9.58
Origin-only ASes present in the Internet Routing Table: 30718
Origin ASes announcing only one prefix: 14937
Transit ASes present in the Internet Routing Table: 4934
Transit-only ASes present in the Internet Routing Table: 120
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 33
Max AS path prepend of ASN (36992) 29
Prefixes from unregistered ASNs in the Routing Table: 323
Unregistered ASNs in the Routing Table: 131
Number of 32-bit ASNs allocated by the RIRs: 1010
Prefixes from 32-bit ASNs in the Routing Table: 4
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 214
Number of addresses announced to Internet: 2435449696
Equivalent to 145 /8s, 42 /16s and 3 /24s
Percentage of available address space announced: 65.7
Percentage of allocated address space announced: 67.9
Percentage of available address space allocated: 96.8
Percentage of address space in use by end-sites: 87.7
Total number of prefixes smaller than registry allocations: 140508

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 84620
Total APNIC prefixes after maximum aggregation: 28805
APNIC Deaggregation factor: 2.94
Prefixes being announced from the APNIC address blocks: 81427
Unique aggregates announced from the APNIC address blocks: 35390
APNIC Region origin ASes present in the Internet Routing Table: 4302
APNIC Prefixes per ASN: 18.93
APNIC Region origin ASes announcing only one prefix: 1213
APNIC Region transit ASes present in the Internet Routing Table: 692
Average APNIC Region AS path length visible: 4.4
Max APNIC Region AS path length visible: 20
Number of APNIC addresses announced to Internet: 579810080
Equivalent to 34 /8s, 143 /16s and 51 /24s
Percentage of available APNIC address space announced: 78.5

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079
55296-56319, 131072-132095
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 42/8, 43/8, 49/8,
58/8, 59/8, 60/8, 61/8, 101/8, 110/8, 111/8,
112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8,
119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8,
126/8, 133/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 137694
Total ARIN prefixes after maximum aggregation: 70478
ARIN Deaggregation factor: 1.95
Prefixes being announced from the ARIN address blocks: 108784
Unique aggregates announced from the ARIN address blocks: 44306
ARIN Region origin ASes present in the Internet Routing Table: 14127
ARIN Prefixes per ASN: 7.70
ARIN Region origin ASes announcing only one prefix: 5405
ARIN Region transit ASes present in the Internet Routing Table: 1479
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 23
Number of ARIN addresses announced to Internet: 778443392
Equivalent to 46 /8s, 102 /16s and 26 /24s
Percentage of available ARIN address space announced: 65.4

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 47/8, 48/8, 50/8, 52/8, 54/8,
55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8,
68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8,
75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8,
107/8, 108/8, 173/8, 174/8, 184/8, 199/8, 204/8,
205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8,
216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 80445
Total RIPE prefixes after maximum aggregation: 45915
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 73908
Unique aggregates announced from the RIPE address blocks: 47984
RIPE Region origin ASes present in the Internet Routing Table: 15190
RIPE Prefixes per ASN: 4.87
RIPE Region origin ASes announcing only one prefix: 7750
RIPE Region transit ASes present in the Internet Routing Table: 2368
Average RIPE Region AS path length visible: 4.7
Max RIPE Region AS path length visible: 33
Number of RIPE addresses announced to Internet: 455509568
Equivalent to 27 /8s, 38 /16s and 134 /24s
Percentage of available RIPE address space announced: 75.4

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 31257
Total LACNIC prefixes after maximum aggregation: 7220
LACNIC Deaggregation factor: 4.33
Prefixes being announced from the LACNIC address blocks: 30007
Unique aggregates announced from the LACNIC address blocks: 15668
LACNIC Region origin ASes present in the Internet Routing Table: 1416
LACNIC Prefixes per ASN: 21.19
LACNIC Region origin ASes announcing only one prefix: 430
LACNIC Region transit ASes present in the Internet Routing Table: 249
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 19
Number of LACNIC addresses announced to Internet: 79085824
Equivalent to 4 /8s, 182 /16s and 193 /24s
Percentage of available LACNIC address space announced: 58.9

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 181/8, 186/8, 187/8, 189/8, 190/8, 200/8,
201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 7426
Total AfriNIC prefixes after maximum aggregation: 1968
AfriNIC Deaggregation factor: 3.77
Prefixes being announced from the AfriNIC address blocks: 5761
Unique aggregates announced from the AfriNIC address blocks: 1864
AfriNIC Region origin ASes present in the Internet Routing Table: 436
AfriNIC Prefixes per ASN: 13.21
AfriNIC Region origin ASes announcing only one prefix: 139
AfriNIC Region transit ASes present in the Internet Routing Table: 91
Average AfriNIC Region AS path length visible: 5.5
Max AfriNIC Region AS path length visible: 31
Number of AfriNIC addresses announced to Internet: 21750784
Equivalent to 1 /8s, 75 /16s and 228 /24s
Percentage of available AfriNIC address space announced: 43.2

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 1909 9484 521 Korea Telecom (KIX)
7545 1562 299 77 TPG Internet Pty Ltd
17974 1411 459 28 PT TELEKOMUNIKASI INDONESIA
4755 1396 636 159 TATA Communications formerly
24560 1093 317 181 Bharti Airtel Ltd., Telemedia
4808 1014 2108 287 CNCGROUP IP network: China169
9583 975 72 498 Sify Limited
17488 949 162 103 Hathway IP Over Cable Interne
18101 920 117 142 Reliance Infocom Ltd Internet
9829 861 728 47 BSNL National Internet Backbo

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3713 3855 267 bellsouth.net, inc.
4323 2647 1077 403 Time Warner Telecom
19262 1838 4941 286 Verizon Global Networks
1785 1786 697 133 PaeTec Communications, Inc.
20115 1508 1530 641 Charter Communications
6478 1451 288 74 AT&T Worldnet Services
7018 1373 5651 885 AT&T WorldNet Services
2386 1299 553 934 AT&T Data Communications Serv
11492 1277 234 71 Cable One
22773 1270 2864 74 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6830 501 1763 307 UPC Distribution Services
34984 457 97 137 BILISIM TELEKOM
3292 441 2010 385 TDC Tele Danmark
8866 440 137 24 Bulgarian Telecommunication C
9198 432 266 14 Kazakhtelecom Data Network Ad
12479 403 577 6 Uni2 Autonomous System
8551 402 353 46 Bezeq International
3320 401 7618 350 Deutsche Telekom AG
702 399 1849 312 UUNET - Commercial IP service
20940 389 91 301 Akamai Technologies European

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1349 251 167 TVCABLE BOGOTA
8151 1323 2607 360 UniNet S.A. de C.V.
28573 1231 951 79 NET Servicos de Comunicao S.A
6503 1146 355 79 AVANTEL, S.A.
7303 866 459 112 Telecom Argentina Stet-France
14420 603 50 88 CORPORACION NACIONAL DE TELEC
22047 566 310 15 VTR PUNTO NET S.A.
3816 497 217 97 Empresa Nacional de Telecomun
7738 478 922 30 Telecomunicacoes da Bahia S.A
14117 455 33 33 Telefonica del Sur S.A.

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8452 791 445 11 TEDATA
24863 753 147 39 LINKdotNET AS number
36992 633 281 155 Etisalat MISR
3741 264 987 226 The Internet Solution
24835 216 78 10 RAYA Telecom - Egypt
6713 203 199 12 Itissalat Al-MAGHRIB
29571 202 19 13 Ci Telecom Autonomous system
33776 184 12 14 Starcomms Nigeria Limited
2018 166 277 64 Tertiary Education Network
16637 160 440 90 MTN Network Solutions

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3713 3855 267 bellsouth.net, inc.
4323 2647 1077 403 Time Warner Telecom
4766 1909 9484 521 Korea Telecom (KIX)
19262 1838 4941 286 Verizon Global Networks
1785 1786 697 133 PaeTec Communications, Inc.
7545 1562 299 77 TPG Internet Pty Ltd
20115 1508 1530 641 Charter Communications
6478 1451 288 74 AT&T Worldnet Services
17974 1411 459 28 PT TELEKOMUNIKASI INDONESIA
4755 1396 636 159 TATA Communications formerly

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
4323 2647 2244 Time Warner Telecom
1785 1786 1653 PaeTec Communications, Inc.
19262 1838 1552 Verizon Global Networks
7545 1562 1485 TPG Internet Pty Ltd
4766 1909 1388 Korea Telecom (KIX)
17974 1411 1383 PT TELEKOMUNIKASI INDONESIA
6478 1451 1377 AT&T Worldnet Services
4755 1396 1237 TATA Communications formerly
11492 1277 1206 Cable One
22773 1270 1196 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
16927 UNALLOCATED 12.0.252.0/23 7018 AT&T WorldNet Servic
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
13746 UNALLOCATED 12.24.56.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.155.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
5.0.0.0/16 12654 RIPE NCC RIS Project
5.0.0.0/8 237 Merit Network
5.1.0.0/21 12654 RIPE NCC RIS Project
5.1.24.0/24 12654 RIPE NCC RIS Project
24.129.192.0/19 7922 Continental Cablevision
37.0.0.0/16 12654 RIPE NCC RIS Project
37.0.0.0/8 237 Merit Network
37.1.0.0/21 12654 RIPE NCC RIS Project
37.1.24.0/24 12654 RIPE NCC RIS Project
41.222.79.0/24 36938 >>UNKNOWN<<

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:25 /9:10 /10:25 /11:70 /12:214
/13:437 /14:758 /15:1350 /16:11461 /17:5601 /18:9268
/19:18743 /20:24164 /21:24488 /22:32338 /23:31234 /24:178677
/25:977 /26:1067 /27:575 /28:160 /29:16 /30:2
/31:0 /32:8

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
6389 2292 3713 bellsouth.net, inc.
4323 1430 2647 Time Warner Telecom
6478 1407 1451 AT&T Worldnet Services
10620 1240 1349 TVCABLE BOGOTA
11492 1233 1277 Cable One
18566 1098 1117 Covad Communications
7011 1068 1171 Citizens Utilities
1785 1060 1786 PaeTec Communications, Inc.
19262 952 1838 Verizon Global Networks
6503 932 1146 AVANTEL, S.A.

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:162 2:23 4:13 5:1 8:325 12:2030
13:6 14:318 15:15 16:3 17:8 20:9
23:1 24:1460 27:539 32:61 33:5 34:2
36:1 37:1 38:688 40:101 41:2318 42:1
44:3 46:509 47:5 49:139 50:49 52:12
55:5 56:2 57:29 58:865 59:484 60:389
61:1111 62:1040 63:1932 64:3762 65:2346 66:4108
67:1752 68:996 69:2879 70:717 71:387 72:1986
73:1 74:2292 75:290 76:327 77:852 78:694
79:435 80:1026 81:815 82:527 83:452 84:630
85:1038 86:524 87:723 88:344 89:1558 90:153
91:3399 92:493 93:1030 94:1153 95:749 96:412
97:248 98:751 99:33 101:25 107:3 108:79
109:845 110:467 111:697 112:310 113:363 114:491
115:628 116:880 117:675 118:631 119:1032 120:238
121:698 122:1595 123:1036 124:1257 125:1213 128:247
129:157 130:171 131:568 132:112 133:20 134:218
135:50 136:216 137:146 138:290 139:109 140:462
141:198 142:359 143:377 144:488 145:51 146:426
147:192 148:626 149:303 150:153 151:230 152:299
153:175 154:3 155:345 156:173 157:340 158:126
159:377 160:314 161:193 162:278 163:161 164:459
165:334 166:473 167:421 168:740 169:151 170:745
171:68 172:5 173:1212 174:503 175:308 176:1
177:3 178:736 180:751 182:391 183:246 184:203
186:920 187:777 188:886 189:1000 190:4326 192:5771
193:4797 194:3492 195:2926 196:1233 197:1 198:3547
199:3713 200:5599 201:1573 202:8259 203:8423 204:4063
205:2338 206:2519 207:2975 208:3869 209:3491 210:2625
211:1333 212:1859 213:1725 214:745 215:62 216:4837
217:1631 218:526 219:383 220:1196 221:439 222:317
223:88

End of report
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