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 5, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Wed 06 Apr, 2011

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

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

BGP routing table entries examined: 352005
Prefixes after maximum aggregation: 159796
Deaggregation factor: 2.20
Unique aggregates announced to Internet: 174324
Total ASes present in the Internet Routing Table: 37182
Prefixes per ASN: 9.47
Origin-only ASes present in the Internet Routing Table: 31216
Origin ASes announcing only one prefix: 15018
Transit ASes present in the Internet Routing Table: 5009
Transit-only ASes present in the Internet Routing Table: 133
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 24
Max AS path prepend of ASN (36992) 22
Prefixes from unregistered ASNs in the Routing Table: 536
Unregistered ASNs in the Routing Table: 236
Number of 32-bit ASNs allocated by the RIRs: 1259
Number of 32-bit ASNs visible in the Routing Table: 957
Prefixes from 32-bit ASNs in the Routing Table: 2120
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 193
Number of addresses announced to Internet: 2402715936
Equivalent to 143 /8s, 54 /16s and 137 /24s
Percentage of available address space announced: 64.8
Percentage of allocated address space announced: 64.8
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 90.2
Total number of prefixes smaller than registry allocations: 145757

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

Prefixes being announced by APNIC Region ASes: 87681
Total APNIC prefixes after maximum aggregation: 29876
APNIC Deaggregation factor: 2.93
Prefixes being announced from the APNIC address blocks: 84624
Unique aggregates announced from the APNIC address blocks: 36733
APNIC Region origin ASes present in the Internet Routing Table: 4388
APNIC Prefixes per ASN: 19.29
APNIC Region origin ASes announcing only one prefix: 1214
APNIC Region transit ASes present in the Internet Routing Table: 699
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: 46
Number of APNIC addresses announced to Internet: 602669856
Equivalent to 35 /8s, 236 /16s and 3 /24s
Percentage of available APNIC address space announced: 76.4

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: 138606
Total ARIN prefixes after maximum aggregation: 70790
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 111117
Unique aggregates announced from the ARIN address blocks: 45037
ARIN Region origin ASes present in the Internet Routing Table: 14293
ARIN Prefixes per ASN: 7.77
ARIN Region origin ASes announcing only one prefix: 5458
ARIN Region transit ASes present in the Internet Routing Table: 1483
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: 10
Number of ARIN addresses announced to Internet: 797667584
Equivalent to 47 /8s, 139 /16s and 113 /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: 83330
Total RIPE prefixes after maximum aggregation: 47523
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 76567
Unique aggregates announced from the RIPE address blocks: 50499
RIPE Region origin ASes present in the Internet Routing Table: 15479
RIPE Prefixes per ASN: 4.95
RIPE Region origin ASes announcing only one prefix: 7785
RIPE Region transit ASes present in the Internet Routing Table: 2416
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 23
Number of RIPE region 32-bit ASNs visible in the Routing Table: 706
Number of RIPE addresses announced to Internet: 465786112
Equivalent to 27 /8s, 195 /16s and 85 /24s
Percentage of available RIPE address space announced: 75.0

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: 32395
Total LACNIC prefixes after maximum aggregation: 7399
LACNIC Deaggregation factor: 4.38
Prefixes being announced from the LACNIC address blocks: 31328
Unique aggregates announced from the LACNIC address blocks: 16283
LACNIC Region origin ASes present in the Internet Routing Table: 1435
LACNIC Prefixes per ASN: 21.83
LACNIC Region origin ASes announcing only one prefix: 430
LACNIC Region transit ASes present in the Internet Routing Table: 258
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: 190
Number of LACNIC addresses announced to Internet: 81698688
Equivalent to 4 /8s, 222 /16s and 159 /24s
Percentage of available LACNIC address space announced: 54.1

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: 7610
Total AfriNIC prefixes after maximum aggregation: 1833
AfriNIC Deaggregation factor: 4.15
Prefixes being announced from the AfriNIC address blocks: 5995
Unique aggregates announced from the AfriNIC address blocks: 1872
AfriNIC Region origin ASes present in the Internet Routing Table: 441
AfriNIC Prefixes per ASN: 13.59
AfriNIC Region origin ASes announcing only one prefix: 131
AfriNIC Region transit ASes present in the Internet Routing Table: 96
Average AfriNIC Region AS path length visible: 5.1
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: 22709760
Equivalent to 1 /8s, 90 /16s and 134 /24s
Percentage of available AfriNIC address space announced: 33.8

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 2439 9515 909 Korea Telecom (KIX)
7545 1545 301 85 TPG Internet Pty Ltd
17974 1446 480 33 PT TELEKOMUNIKASI INDONESIA
4755 1439 634 167 TATA Communications formerly
24560 1137 322 204 Bharti Airtel Ltd., Telemedia
4808 1061 2140 294 CNCGROUP IP network: China169
9583 1055 77 494 Sify Limited
9829 1001 867 54 BSNL National Internet Backbo
17488 941 162 97 Hathway IP Over Cable Interne
18101 935 116 139 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 3665 3838 263 bellsouth.net, inc.
4323 2538 1090 394 Time Warner Telecom
1785 1788 681 131 PaeTec Communications, Inc.
18566 1606 331 195 Covad Communications
6478 1605 305 34 AT&T Worldnet Services
20115 1535 1551 641 Charter Communications
19262 1491 4939 299 Verizon Global Networks
7018 1351 6769 878 AT&T WorldNet Services
11492 1314 240 15 Cable One
22773 1292 2865 84 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 515 1780 319 UPC Distribution Services
34984 484 97 186 BILISIM TELEKOM
3292 454 2013 391 TDC Tele Danmark
8866 446 134 26 Bulgarian Telecommunication C
20940 446 127 337 Akamai Technologies European
3320 413 7604 359 Deutsche Telekom AG
8551 403 353 46 Bezeq International
12479 401 577 6 Uni2 Autonomous System
702 395 1800 308 UUNET - Commercial IP service
8402 394 320 11 Corbina telecom

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 1405 262 152 TVCABLE BOGOTA
28573 1267 972 86 NET Servicos de Comunicao S.A
8151 1239 2677 373 UniNet S.A. de C.V.
6503 1110 354 72 AVANTEL, S.A.
7303 923 465 148 Telecom Argentina Stet-France
14420 642 52 91 CORPORACION NACIONAL DE TELEC
22047 568 310 15 VTR PUNTO NET S.A.
3816 514 225 98 Empresa Nacional de Telecomun
11172 487 99 80 Servicios Alestra S.A de C.V
27947 480 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 838 445 11 TEDATA
24863 776 147 39 LINKdotNET AS number
15475 420 90 8 Nile Online
36992 292 271 14 Etisalat MISR
3741 266 985 227 The Internet Solution
6713 231 215 12 Itissalat Al-MAGHRIB
24835 231 78 10 RAYA Telecom - Egypt
33776 227 13 5 Starcomms Nigeria Limited
29571 191 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 3665 3838 263 bellsouth.net, inc.
4323 2538 1090 394 Time Warner Telecom
4766 2439 9515 909 Korea Telecom (KIX)
23456 2120 507 1138 32-bit ASN transition
1785 1788 681 131 PaeTec Communications, Inc.
18566 1606 331 195 Covad Communications
6478 1605 305 34 AT&T Worldnet Services
7545 1545 301 85 TPG Internet Pty Ltd
20115 1535 1551 641 Charter Communications
19262 1491 4939 299 Verizon Global Networks

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 2538 2144 Time Warner Telecom
1785 1788 1657 PaeTec Communications, Inc.
6478 1605 1571 AT&T Worldnet Services
4766 2439 1530 Korea Telecom (KIX)
7545 1545 1460 TPG Internet Pty Ltd
17974 1446 1413 PT TELEKOMUNIKASI INDONESIA
18566 1606 1411 Covad Communications
11492 1314 1299 Cable One
4755 1439 1272 TATA Communications formerly
10620 1405 1253 TVCABLE BOGOTA

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
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
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic

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

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

Network Origin AS Description
1.3.0.0/16 38639 NTT Communications Corporatio
2.56.0.0/16 44559 E-Rent LLC
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
31.171.240.0/20 50837 CLOUDSIGMA AG
41.57.192.0/18 22750 BCSNET

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 /8:19 /9:12 /10:26 /11:74 /12:218
/13:447 /14:770 /15:1376 /16:11571 /17:5726 /18:9435
/19:19096 /20:24913 /21:25351 /22:33651 /23:32209 /24:183970
/25:1119 /26:1271 /27:694 /28:40 /29:9 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2259 3665 bellsouth.net, inc.
18566 1585 1606 Covad Communications
6478 1559 1605 AT&T Worldnet Services
4323 1360 2538 Time Warner Telecom
10620 1295 1405 TVCABLE BOGOTA
11492 1263 1314 Cable One
23456 1104 2120 32-bit ASN transition
7011 1067 1167 Citizens Utilities
1785 1056 1788 PaeTec Communications, Inc.
6503 895 1110 AVANTEL, S.A.

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

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

1:297 2:57 4:14 5:1 8:351 12:2006
13:1 14:432 15:15 16:3 17:8 20:9
23:5 24:1592 27:711 31:56 32:60 33:2
34:2 37:1 38:751 39:1 40:101 41:2372
42:1 44:3 46:797 47:4 49:149 50:151
52:13 55:4 56:2 57:30 58:840 59:486
60:387 61:1156 62:1006 63:1915 64:3872 65:2333
66:4306 67:1809 68:1076 69:2943 70:701 71:343
72:1899 73:1 74:2328 75:285 76:336 77:852
78:699 79:459 80:1086 81:821 82:508 83:464
84:648 85:1040 86:557 87:763 88:339 89:1587
90:176 91:3650 92:497 93:1050 94:1259 95:780
96:459 97:253 98:818 99:35 101:49 106:1
107:4 108:78 109:937 110:531 111:675 112:324
113:387 114:512 115:703 116:934 117:675 118:764
119:1131 120:288 121:713 122:1612 123:1057 124:1275
125:1251 128:265 129:174 130:172 131:563 132:101
133:20 134:217 135:49 136:213 137:142 138:301
139:105 140:487 141:173 142:378 143:385 144:478
145:52 146:443 147:202 148:628 149:273 150:168
151:187 152:298 153:180 154:3 155:389 156:188
157:353 158:131 159:381 160:315 161:241 162:276
163:165 164:489 165:350 166:502 167:415 168:720
169:154 170:776 171:74 172:2 173:1261 174:532
175:351 177:76 178:802 180:811 181:5 182:417
183:198 184:239 185:1 186:1111 187:917 188:930
189:1040 190:4822 192:5767 193:4810 194:3469 195:2948
196:1197 197:17 198:3590 199:3883 200:5561 201:1487
202:8363 203:8458 204:4124 205:2317 206:2654 207:3005
208:3916 209:3503 210:2719 211:1366 212:1970 213:1701
214:735 215:66 216:4848 217:1628 218:558 219:383
220:1196 221:480 222:318 223:117

End of report
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