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.

Tuesday, April 19, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Wed 20 Apr, 2011

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

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

BGP routing table entries examined: 354891
Prefixes after maximum aggregation: 160533
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 174996
Total ASes present in the Internet Routing Table: 37342
Prefixes per ASN: 9.50
Origin-only ASes present in the Internet Routing Table: 31303
Origin ASes announcing only one prefix: 15060
Transit ASes present in the Internet Routing Table: 5031
Transit-only ASes present in the Internet Routing Table: 130
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 36
Max AS path prepend of ASN (36992) 29
Prefixes from unregistered ASNs in the Routing Table: 555
Unregistered ASNs in the Routing Table: 271
Number of 32-bit ASNs allocated by the RIRs: 1303
Number of 32-bit ASNs visible in the Routing Table: 1008
Prefixes from 32-bit ASNs in the Routing Table: 2249
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 153
Number of addresses announced to Internet: 2413964864
Equivalent to 143 /8s, 226 /16s and 46 /24s
Percentage of available address space announced: 65.1
Percentage of allocated address space announced: 65.1
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 90.5
Total number of prefixes smaller than registry allocations: 147060

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

Prefixes being announced by APNIC Region ASes: 88417
Total APNIC prefixes after maximum aggregation: 29891
APNIC Deaggregation factor: 2.96
Prefixes being announced from the APNIC address blocks: 85412
Unique aggregates announced from the APNIC address blocks: 36840
APNIC Region origin ASes present in the Internet Routing Table: 4412
APNIC Prefixes per ASN: 19.36
APNIC Region origin ASes announcing only one prefix: 1226
APNIC Region transit ASes present in the Internet Routing Table: 697
Average APNIC Region AS path length visible: 4.6
Max APNIC Region AS path length visible: 18
Number of APNIC region 32-bit ASNs visible in the Routing Table: 48
Number of APNIC addresses announced to Internet: 610151968
Equivalent to 36 /8s, 94 /16s and 46 /24s
Percentage of available APNIC address space announced: 77.4

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: 139901
Total ARIN prefixes after maximum aggregation: 71053
ARIN Deaggregation factor: 1.97
Prefixes being announced from the ARIN address blocks: 112303
Unique aggregates announced from the ARIN address blocks: 45109
ARIN Region origin ASes present in the Internet Routing Table: 14327
ARIN Prefixes per ASN: 7.84
ARIN Region origin ASes announcing only one prefix: 5476
ARIN Region transit ASes present in the Internet Routing Table: 1487
Average ARIN Region AS path length visible: 3.9
Max ARIN Region AS path length visible: 23
Number of ARIN region 32-bit ASNs visible in the Routing Table: 11
Number of ARIN addresses announced to Internet: 797970176
Equivalent to 47 /8s, 144 /16s and 15 /24s
Percentage of available ARIN address space announced: 63.4

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, 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: 83934
Total RIPE prefixes after maximum aggregation: 47778
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 77066
Unique aggregates announced from the RIPE address blocks: 50730
RIPE Region origin ASes present in the Internet Routing Table: 15523
RIPE Prefixes per ASN: 4.96
RIPE Region origin ASes announcing only one prefix: 7793
RIPE Region transit ASes present in the Internet Routing Table: 2424
Average RIPE Region AS path length visible: 4.7
Max RIPE Region AS path length visible: 36
Number of RIPE region 32-bit ASNs visible in the Routing Table: 745
Number of RIPE addresses announced to Internet: 466240512
Equivalent to 27 /8s, 202 /16s and 68 /24s
Percentage of available RIPE address space announced: 75.1

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: 32455
Total LACNIC prefixes after maximum aggregation: 7433
LACNIC Deaggregation factor: 4.37
Prefixes being announced from the LACNIC address blocks: 31418
Unique aggregates announced from the LACNIC address blocks: 16438
LACNIC Region origin ASes present in the Internet Routing Table: 1440
LACNIC Prefixes per ASN: 21.82
LACNIC Region origin ASes announcing only one prefix: 432
LACNIC Region transit ASes present in the Internet Routing Table: 261
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 19
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 199
Number of LACNIC addresses announced to Internet: 82378880
Equivalent to 4 /8s, 233 /16s and 0 /24s
Percentage of available LACNIC address space announced: 54.6

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: 7706
Total AfriNIC prefixes after maximum aggregation: 1831
AfriNIC Deaggregation factor: 4.21
Prefixes being announced from the AfriNIC address blocks: 6059
Unique aggregates announced from the AfriNIC address blocks: 1889
AfriNIC Region origin ASes present in the Internet Routing Table: 447
AfriNIC Prefixes per ASN: 13.55
AfriNIC Region origin ASes announcing only one prefix: 133
AfriNIC Region transit ASes present in the Internet Routing Table: 99
Average AfriNIC Region AS path length visible: 4.7
Max AfriNIC Region AS path length visible: 31
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 5
Number of AfriNIC addresses announced to Internet: 23357952
Equivalent to 1 /8s, 100 /16s and 106 /24s
Percentage of available AfriNIC address space announced: 34.8

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 2431 9484 903 Korea Telecom (KIX)
17974 1816 515 29 PT TELEKOMUNIKASI INDONESIA
7545 1549 301 82 TPG Internet Pty Ltd
4755 1446 638 167 TATA Communications formerly
24560 1138 322 203 Bharti Airtel Ltd., Telemedia
9583 1054 77 495 Sify Limited
4808 1032 2102 293 CNCGROUP IP network: China169
9829 1001 866 56 BSNL National Internet Backbo
17488 942 164 98 Hathway IP Over Cable Interne
18101 934 116 139 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 3660 3822 255 bellsouth.net, inc.
4323 2647 1090 397 Time Warner Telecom
1785 1788 681 128 PaeTec Communications, Inc.
18566 1760 349 229 Covad Communications
6478 1629 308 38 AT&T Worldnet Services
20115 1534 1550 639 Charter Communications
19262 1495 4949 298 Verizon Global Networks
7018 1355 6801 883 AT&T WorldNet Services
22773 1299 2865 84 Cox Communications, Inc.
2386 1269 536 911 AT&T Data Communications Serv

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 519 1780 321 UPC Distribution Services
34984 508 106 182 BILISIM TELEKOM
29049 466 33 37 AzerSat LLC.
3292 455 1997 391 TDC Tele Danmark
8866 446 134 26 Bulgarian Telecommunication C
20940 436 126 335 Akamai Technologies European
3320 419 7608 365 Deutsche Telekom AG
12479 406 577 6 Uni2 Autonomous System
8551 403 353 46 Bezeq International
702 396 1802 309 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 1430 266 157 TVCABLE BOGOTA
28573 1283 988 87 NET Servicos de Comunicao S.A
8151 1252 2688 371 UniNet S.A. de C.V.
7303 928 467 148 Telecom Argentina Stet-France
6503 906 354 72 AVANTEL, S.A.
14420 663 53 91 CORPORACION NACIONAL DE TELEC
22047 568 310 15 VTR PUNTO NET S.A.
3816 516 225 98 Empresa Nacional de Telecomun
11172 487 99 81 Servicios Alestra S.A de C.V
27947 483 53 53 Telconet 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 839 445 11 TEDATA
24863 778 147 39 LINKdotNET AS number
15475 422 90 8 Nile Online
36992 297 415 13 Etisalat MISR
3741 267 985 227 The Internet Solution
6713 235 215 13 Itissalat Al-MAGHRIB
33776 227 13 5 Starcomms Nigeria Limited
24835 217 78 10 RAYA Telecom - Egypt
29571 161 17 11 Ci Telecom Autonomous system
16637 148 441 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 3660 3822 255 bellsouth.net, inc.
4323 2647 1090 397 Time Warner Telecom
4766 2431 9484 903 Korea Telecom (KIX)
23456 2249 657 1225 32-bit ASN transition
17974 1816 515 29 PT TELEKOMUNIKASI INDONESIA
1785 1788 681 128 PaeTec Communications, Inc.
18566 1760 349 229 Covad Communications
6478 1629 308 38 AT&T Worldnet Services
7545 1549 301 82 TPG Internet Pty Ltd
20115 1534 1550 639 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
4323 2647 2250 Time Warner Telecom
17974 1816 1787 PT TELEKOMUNIKASI INDONESIA
1785 1788 1660 PaeTec Communications, Inc.
6478 1629 1591 AT&T Worldnet Services
18566 1760 1531 Covad Communications
4766 2431 1528 Korea Telecom (KIX)
7545 1549 1467 TPG Internet Pty Ltd
4755 1446 1279 TATA Communications formerly
10620 1430 1273 TVCABLE BOGOTA
11492 1264 1249 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
45083 UNALLOCATED 1.45.0.0/16 4808 CNCGROUP IP network:
45083 UNALLOCATED 1.45.92.0/22 4808 CNCGROUP IP network:
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

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
31.12.96.0/19 29550 PoundHost Internet Services.
31.13.0.0/21 29550 PoundHost Internet Services.
41.222.79.0/24 36938 >>UNKNOWN<<
41.223.92.0/22 36936 >>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 /8:20 /9:12 /10:28 /11:77 /12:220
/13:454 /14:777 /15:1376 /16:11632 /17:5740 /18:9521
/19:19176 /20:25200 /21:25612 /22:33706 /23:32588 /24:185602
/25:1114 /26:1281 /27:700 /28:39 /29:8 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2258 3660 bellsouth.net, inc.
18566 1728 1760 Covad Communications
6478 1583 1629 AT&T Worldnet Services
4323 1345 2647 Time Warner Telecom
10620 1320 1430 TVCABLE BOGOTA
11492 1213 1264 Cable One
23456 1136 2249 32-bit ASN transition
7011 1062 1161 Citizens Utilities
1785 1058 1788 PaeTec Communications, Inc.
22773 843 1299 Cox Communications, Inc.

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

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

1:257 2:52 4:14 5:1 6:1 8:347
12:2011 13:1 14:439 15:15 16:3 17:8
20:9 23:5 24:1605 27:709 31:222 32:60
33:3 34:2 37:1 38:764 40:101 41:2395
42:1 44:3 46:860 47:4 49:171 50:360
52:13 55:5 56:2 57:31 58:843 59:482
60:387 61:1293 62:1005 63:1920 64:3928 65:2324
66:4351 67:1821 68:1081 69:2965 70:701 71:345
72:1907 73:1 74:2346 75:298 76:336 77:820
78:690 79:460 80:1104 81:829 82:504 83:452
84:646 85:1078 86:566 87:759 88:331 89:1578
90:181 91:3706 92:502 93:1059 94:1258 95:787
96:459 97:251 98:822 99:35 101:63 103:5
106:1 107:4 108:84 109:938 110:557 111:692
112:326 113:388 114:522 115:689 116:945 117:674
118:806 119:1150 120:292 121:702 122:1627 123:1068
124:1248 125:1266 128:264 129:164 130:172 131:566
132:113 133:20 134:218 135:49 136:214 137:142
138:301 139:103 140:486 141:174 142:398 143:393
144:485 145:53 146:441 147:204 148:591 149:243
150:169 151:187 152:307 153:179 154:3 155:394
156:191 157:354 158:129 159:382 160:317 161:243
162:277 163:164 164:486 165:350 166:511 167:427
168:724 169:154 170:783 171:76 172:1 173:1494
174:531 175:359 177:72 178:854 180:820 181:9
182:429 183:197 184:253 185:1 186:1144 187:802
188:986 189:978 190:4842 192:5787 193:4823 194:3469
195:2961 196:1203 197:16 198:3564 199:3920 200:5540
201:1500 202:8348 203:8467 204:4118 205:2328 206:2744
207:3028 208:3961 209:3506 210:2732 211:1364 212:1984
213:1707 214:736 215:67 216:4862 217:1655 218:555
219:394 220:1194 221:479 222:341 223:143

End of report
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