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.

Wednesday, June 1, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Thu 02 Jun, 2011

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

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

BGP routing table entries examined: 358417
Prefixes after maximum aggregation: 162179
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 177647
Total ASes present in the Internet Routing Table: 37742
Prefixes per ASN: 9.50
Origin-only ASes present in the Internet Routing Table: 31521
Origin ASes announcing only one prefix: 15143
Transit ASes present in the Internet Routing Table: 5101
Transit-only ASes present in the Internet Routing Table: 137
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 36
Max AS path prepend of ASN (48687) 24
Prefixes from unregistered ASNs in the Routing Table: 738
Unregistered ASNs in the Routing Table: 392
Number of 32-bit ASNs allocated by the RIRs: 1413
Number of 32-bit ASNs visible in the Routing Table: 1120
Prefixes from 32-bit ASNs in the Routing Table: 2574
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 166
Number of addresses announced to Internet: 2441781760
Equivalent to 145 /8s, 138 /16s and 162 /24s
Percentage of available address space announced: 65.9
Percentage of allocated address space announced: 65.9
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 91.0
Total number of prefixes smaller than registry allocations: 149527

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

Prefixes being announced by APNIC Region ASes: 88852
Total APNIC prefixes after maximum aggregation: 30027
APNIC Deaggregation factor: 2.96
Prefixes being announced from the APNIC address blocks: 85309
Unique aggregates announced from the APNIC address blocks: 36720
APNIC Region origin ASes present in the Internet Routing Table: 4471
APNIC Prefixes per ASN: 19.08
APNIC Region origin ASes announcing only one prefix: 1251
APNIC Region transit ASes present in the Internet Routing Table: 702
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 20
Number of APNIC region 32-bit ASNs visible in the Routing Table: 47
Number of APNIC addresses announced to Internet: 619727904
Equivalent to 36 /8s, 240 /16s and 76 /24s
Percentage of available APNIC address space announced: 78.6

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, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 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: 140543
Total ARIN prefixes after maximum aggregation: 71372
ARIN Deaggregation factor: 1.97
Prefixes being announced from the ARIN address blocks: 112793
Unique aggregates announced from the ARIN address blocks: 45885
ARIN Region origin ASes present in the Internet Routing Table: 14396
ARIN Prefixes per ASN: 7.84
ARIN Region origin ASes announcing only one prefix: 5491
ARIN Region transit ASes present in the Internet Routing Table: 1510
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 23
Number of ARIN region 32-bit ASNs visible in the Routing Table: 12
Number of ARIN addresses announced to Internet: 801937152
Equivalent to 47 /8s, 204 /16s and 151 /24s
Percentage of available ARIN address space announced: 63.7

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, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 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, 104/8, 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: 85025
Total RIPE prefixes after maximum aggregation: 48464
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 78460
Unique aggregates announced from the RIPE address blocks: 51953
RIPE Region origin ASes present in the Internet Routing Table: 15650
RIPE Prefixes per ASN: 5.01
RIPE Region origin ASes announcing only one prefix: 7833
RIPE Region transit ASes present in the Internet Routing Table: 2466
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 36
Number of RIPE region 32-bit ASNs visible in the Routing Table: 828
Number of RIPE addresses announced to Internet: 474945792
Equivalent to 28 /8s, 79 /16s and 25 /24s
Percentage of available RIPE address space announced: 76.5

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, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

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

Prefixes being announced by LACNIC Region ASes: 33095
Total LACNIC prefixes after maximum aggregation: 7535
LACNIC Deaggregation factor: 4.39
Prefixes being announced from the LACNIC address blocks: 32183
Unique aggregates announced from the LACNIC address blocks: 16926
LACNIC Region origin ASes present in the Internet Routing Table: 1462
LACNIC Prefixes per ASN: 22.01
LACNIC Region origin ASes announcing only one prefix: 428
LACNIC Region transit ASes present in the Internet Routing Table: 264
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 21
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 228
Number of LACNIC addresses announced to Internet: 84436288
Equivalent to 5 /8s, 8 /16s and 101 /24s
Percentage of available LACNIC address space announced: 55.9

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 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: 8091
Total AfriNIC prefixes after maximum aggregation: 1906
AfriNIC Deaggregation factor: 4.25
Prefixes being announced from the AfriNIC address blocks: 6394
Unique aggregates announced from the AfriNIC address blocks: 1927
AfriNIC Region origin ASes present in the Internet Routing Table: 456
AfriNIC Prefixes per ASN: 14.02
AfriNIC Region origin ASes announcing only one prefix: 140
AfriNIC Region transit ASes present in the Internet Routing Table: 99
Average AfriNIC Region AS path length visible: 4.8
Max AfriNIC Region AS path length visible: 24
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 5
Number of AfriNIC addresses announced to Internet: 23552000
Equivalent to 1 /8s, 103 /16s and 96 /24s
Percentage of available AfriNIC address space announced: 35.1

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

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

ASN No of nets /20 equiv MaxAgg Description
4766 2460 9500 922 Korea Telecom (KIX)
17974 1541 441 38 PT TELEKOMUNIKASI INDONESIA
7545 1536 301 85 TPG Internet Pty Ltd
4755 1472 635 168 TATA Communications formerly
24560 1155 337 187 Bharti Airtel Ltd., Telemedia
7552 1138 1064 7 Vietel Corporation
4808 1087 2148 301 CNCGROUP IP network: China169
9583 1078 80 509 Sify Limited
9829 1041 877 53 BSNL National Internet Backbo
18101 932 116 140 Reliance Infocom Ltd Internet

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 3644 3822 257 bellsouth.net, inc.
4323 1972 1081 399 Time Warner Telecom
18566 1875 355 269 Covad Communications
1785 1789 681 123 PaeTec Communications, Inc.
6478 1711 317 47 AT&T Worldnet Services
20115 1535 1540 633 Charter Communications
19262 1491 4936 307 Verizon Global Networks
7018 1362 7052 886 AT&T WorldNet Services
22773 1339 2897 88 Cox Communications, Inc.
11492 1280 240 15 Cable One

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 517 1780 320 UPC Distribution Services
34984 517 106 179 BILISIM TELEKOM
3292 461 2078 396 TDC Tele Danmark
20940 457 134 349 Akamai Technologies European
29049 451 33 48 AzerSat LLC.
8866 445 134 26 Bulgarian Telecommunication C
12479 431 593 7 Uni2 Autonomous System
3320 426 8152 371 Deutsche Telekom AG
8551 406 355 45 Bezeq International
702 396 1803 310 UUNET - Commercial IP service

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 1503 275 158 TVCABLE BOGOTA
8151 1378 2710 364 UniNet S.A. de C.V.
28573 1325 992 86 NET Servicos de Comunicao S.A
7303 958 504 152 Telecom Argentina Stet-France
6503 732 354 73 AVANTEL, S.A.
14420 671 54 89 CORPORACION NACIONAL DE TELEC
22047 565 310 15 VTR PUNTO NET S.A.
3816 525 229 97 Empresa Nacional de Telecomun
7738 516 986 31 Telecomunicacoes da Bahia S.A
13489 514 262 123 Orbitel S.A. E.S.P.

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 821 445 11 TEDATA
24863 792 147 37 LINKdotNET AS number
15475 542 90 8 Nile Online
36992 311 399 15 Etisalat MISR
3741 265 937 226 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
33776 218 12 11 Starcomms Nigeria Limited
24835 208 78 10 RAYA Telecom - Egypt
29571 193 19 12 Ci Telecom Autonomous system
16637 150 441 86 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 3644 3822 257 bellsouth.net, inc.
23456 2574 638 1390 32-bit ASN transition
4766 2460 9500 922 Korea Telecom (KIX)
4323 1972 1081 399 Time Warner Telecom
18566 1875 355 269 Covad Communications
1785 1789 681 123 PaeTec Communications, Inc.
6478 1711 317 47 AT&T Worldnet Services
17974 1541 441 38 PT TELEKOMUNIKASI INDONESIA
7545 1536 301 85 TPG Internet Pty Ltd
20115 1535 1540 633 Charter Communications

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

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

ASN No of nets Net Savings Description
1785 1789 1666 PaeTec Communications, Inc.
6478 1711 1664 AT&T Worldnet Services
18566 1875 1606 Covad Communications
4323 1972 1573 Time Warner Telecom
4766 2460 1538 Korea Telecom (KIX)
17974 1541 1503 PT TELEKOMUNIKASI INDONESIA
7545 1536 1451 TPG Internet Pty Ltd
10620 1503 1345 TVCABLE BOGOTA
4755 1472 1304 TATA Communications formerly
11492 1280 1265 Cable One

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

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

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
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
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic
23502 UNALLOCATED 12.44.44.0/24 7018 AT&T WorldNet Servic

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

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

Network Origin AS Description
24.225.128.0/18 36377 Comcast Telecommunications, I
24.225.192.0/23 36377 Comcast Telecommunications, I
24.225.192.0/18 36377 Comcast Telecommunications, I
24.225.224.0/21 36377 Comcast Telecommunications, I
24.225.237.0/24 36377 Comcast Telecommunications, I
24.225.248.0/21 36377 Comcast Telecommunications, I
27.0.128.0/17 7514 Media Exchange, Inc.
41.190.32.0/23 31856 CABSAS
41.190.34.0/23 31856 CABSAS
41.190.36.0/23 31856 CABSAS

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 /8:20 /9:12 /10:28 /11:81 /12:228
/13:461 /14:796 /15:1394 /16:11773 /17:5841 /18:9767
/19:19332 /20:25708 /21:25926 /22:34095 /23:33075 /24:186626
/25:1081 /26:1277 /27:715 /28:165 /29:8 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2244 3644 bellsouth.net, inc.
18566 1838 1875 Covad Communications
6478 1665 1711 AT&T Worldnet Services
10620 1393 1503 TVCABLE BOGOTA
23456 1248 2574 32-bit ASN transition
11492 1226 1280 Cable One
7011 1061 1160 Citizens Utilities
1785 1051 1789 PaeTec Communications, Inc.
4323 885 1972 Time Warner Telecom
22773 854 1339 Cox Communications, Inc.

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

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

1:281 2:50 4:16 5:1 6:3 8:337
12:1978 13:1 14:463 15:15 16:3 17:8
20:10 23:6 24:1651 27:773 31:361 32:60
33:4 34:2 37:1 38:738 40:102 41:2541
42:6 44:3 46:927 47:3 49:198 50:427
52:13 54:2 55:8 56:2 57:29 58:836
59:481 60:387 61:1162 62:1044 63:1938 64:3941
65:2293 66:4147 67:1865 68:1092 69:3000 70:707
71:352 72:1893 73:1 74:2354 75:305 76:340
77:870 78:703 79:459 80:1087 81:838 82:495
83:440 84:676 85:1068 86:592 87:751 88:331
89:1536 90:203 91:3800 92:519 93:1049 94:1279
95:810 96:505 97:250 98:858 99:35 101:60
103:36 106:1 107:7 108:85 109:953 110:601
111:705 112:304 113:400 114:536 115:679 116:956
117:691 118:789 119:1142 120:311 121:672 122:1627
123:987 124:1267 125:1211 128:262 129:173 130:164
131:572 132:109 133:19 134:213 135:48 136:212
137:144 138:300 139:110 140:479 141:239 142:404
143:403 144:482 145:54 146:447 147:212 148:594
149:242 150:172 151:186 152:328 153:178 154:3
155:397 156:194 157:352 158:138 159:381 160:317
161:207 162:282 163:165 164:500 165:355 166:518
167:428 168:729 169:155 170:804 171:77 172:1
173:1557 174:551 175:372 176:130 177:156 178:995
180:853 181:17 182:455 183:211 184:293 185:1
186:1198 187:769 188:846 189:892 190:4822 192:5841
193:4897 194:3494 195:2993 196:1224 197:19 198:3571
199:3915 200:5544 201:1483 202:8273 203:8393 204:4175
205:2322 206:2685 207:2877 208:3969 209:3472 210:2722
211:1395 212:1987 213:1736 214:732 215:72 216:4927
217:1639 218:545 219:364 220:1203 221:491 222:315
223:149

End of report
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