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.

Sunday, June 5, 2011

[bgp-stats] Routing Table Report - Japan view

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

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

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

BGP routing table entries examined: 358675
Prefixes after maximum aggregation: 162467
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 178152
Total ASes present in the Internet Routing Table: 37778
Prefixes per ASN: 9.49
Origin-only ASes present in the Internet Routing Table: 31536
Origin ASes announcing only one prefix: 15153
Transit ASes present in the Internet Routing Table: 5110
Transit-only ASes present in the Internet Routing Table: 136
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: 748
Unregistered ASNs in the Routing Table: 396
Number of 32-bit ASNs allocated by the RIRs: 1431
Number of 32-bit ASNs visible in the Routing Table: 1132
Prefixes from 32-bit ASNs in the Routing Table: 2611
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 164
Number of addresses announced to Internet: 2451666624
Equivalent to 146 /8s, 33 /16s and 118 /24s
Percentage of available address space announced: 66.1
Percentage of allocated address space announced: 66.1
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: 149662

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

Prefixes being announced by APNIC Region ASes: 88752
Total APNIC prefixes after maximum aggregation: 30060
APNIC Deaggregation factor: 2.95
Prefixes being announced from the APNIC address blocks: 85214
Unique aggregates announced from the APNIC address blocks: 36603
APNIC Region origin ASes present in the Internet Routing Table: 4467
APNIC Prefixes per ASN: 19.08
APNIC Region origin ASes announcing only one prefix: 1245
APNIC Region transit ASes present in the Internet Routing Table: 704
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: 619763232
Equivalent to 36 /8s, 240 /16s and 214 /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: 140613
Total ARIN prefixes after maximum aggregation: 71531
ARIN Deaggregation factor: 1.97
Prefixes being announced from the ARIN address blocks: 112699
Unique aggregates announced from the ARIN address blocks: 46242
ARIN Region origin ASes present in the Internet Routing Table: 14415
ARIN Prefixes per ASN: 7.82
ARIN Region origin ASes announcing only one prefix: 5506
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: 801992448
Equivalent to 47 /8s, 205 /16s and 111 /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: 85276
Total RIPE prefixes after maximum aggregation: 48531
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 78727
Unique aggregates announced from the RIPE address blocks: 52076
RIPE Region origin ASes present in the Internet Routing Table: 15660
RIPE Prefixes per ASN: 5.03
RIPE Region origin ASes announcing only one prefix: 7831
RIPE Region transit ASes present in the Internet Routing Table: 2462
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: 835
Number of RIPE addresses announced to Internet: 475534080
Equivalent to 28 /8s, 88 /16s and 19 /24s
Percentage of available RIPE address space announced: 76.6

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: 33150
Total LACNIC prefixes after maximum aggregation: 7520
LACNIC Deaggregation factor: 4.41
Prefixes being announced from the LACNIC address blocks: 32252
Unique aggregates announced from the LACNIC address blocks: 16948
LACNIC Region origin ASes present in the Internet Routing Table: 1461
LACNIC Prefixes per ASN: 22.08
LACNIC Region origin ASes announcing only one prefix: 432
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: 29
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 233
Number of LACNIC addresses announced to Internet: 84702976
Equivalent to 5 /8s, 12 /16s and 119 /24s
Percentage of available LACNIC address space announced: 56.1

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: 8048
Total AfriNIC prefixes after maximum aggregation: 1909
AfriNIC Deaggregation factor: 4.22
Prefixes being announced from the AfriNIC address blocks: 6370
Unique aggregates announced from the AfriNIC address blocks: 1925
AfriNIC Region origin ASes present in the Internet Routing Table: 457
AfriNIC Prefixes per ASN: 13.94
AfriNIC Region origin ASes announcing only one prefix: 139
AfriNIC Region transit ASes present in the Internet Routing Table: 103
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: 23588096
Equivalent to 1 /8s, 103 /16s and 237 /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 2459 9500 922 Korea Telecom (KIX)
7545 1537 301 85 TPG Internet Pty Ltd
17974 1537 441 38 PT TELEKOMUNIKASI INDONESIA
4755 1469 634 165 TATA Communications formerly
24560 1155 337 187 Bharti Airtel Ltd., Telemedia
7552 1141 1064 7 Vietel Corporation
4808 1086 2144 308 CNCGROUP IP network: China169
9583 1082 80 510 Sify Limited
9829 1041 878 59 BSNL National Internet Backbo
17488 930 170 104 Hathway IP Over Cable Interne

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 3640 3822 256 bellsouth.net, inc.
4323 1977 1081 400 Time Warner Telecom
18566 1875 355 269 Covad Communications
1785 1790 681 122 PaeTec Communications, Inc.
6478 1716 318 45 AT&T Worldnet Services
20115 1535 1540 633 Charter Communications
19262 1492 4936 307 Verizon Global Networks
7018 1362 7068 890 AT&T WorldNet Services
22773 1338 2897 88 Cox Communications, Inc.
2386 1268 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 517 1780 320 UPC Distribution Services
34984 517 106 179 BILISIM TELEKOM
3292 461 2078 396 TDC Tele Danmark
29049 451 33 48 AzerSat LLC.
8866 445 134 26 Bulgarian Telecommunication C
20940 434 121 338 Akamai Technologies European
12479 432 593 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 1512 278 157 TVCABLE BOGOTA
8151 1379 2726 361 UniNet S.A. de C.V.
28573 1322 992 86 NET Servicos de Comunicao S.A
7303 955 504 151 Telecom Argentina Stet-France
6503 735 354 73 AVANTEL, S.A.
14420 675 54 89 CORPORACION NACIONAL DE TELEC
22047 565 310 15 VTR PUNTO NET S.A.
3816 527 231 93 Empresa Nacional de Telecomun
7738 516 986 31 Telecomunicacoes da Bahia S.A
13489 514 262 125 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 798 445 11 TEDATA
24863 793 147 37 LINKdotNET AS number
15475 543 90 8 Nile Online
36992 290 399 14 Etisalat MISR
3741 265 937 226 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
33776 218 12 11 Starcomms Nigeria Limited
24835 211 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 3640 3822 256 bellsouth.net, inc.
23456 2611 644 1411 32-bit ASN transition
4766 2459 9500 922 Korea Telecom (KIX)
4323 1977 1081 400 Time Warner Telecom
18566 1875 355 269 Covad Communications
1785 1790 681 122 PaeTec Communications, Inc.
6478 1716 318 45 AT&T Worldnet Services
7545 1537 301 85 TPG Internet Pty Ltd
17974 1537 441 38 PT TELEKOMUNIKASI INDONESIA
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
6478 1716 1671 AT&T Worldnet Services
1785 1790 1668 PaeTec Communications, Inc.
18566 1875 1606 Covad Communications
4323 1977 1577 Time Warner Telecom
4766 2459 1537 Korea Telecom (KIX)
17974 1537 1499 PT TELEKOMUNIKASI INDONESIA
7545 1537 1452 TPG Internet Pty Ltd
10620 1512 1355 TVCABLE BOGOTA
4755 1469 1304 TATA Communications formerly
22773 1338 1250 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
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 /14:798 /15:1395 /16:11913 /17:5844 /18:9772
/19:19351 /20:25742 /21:25931 /22:34131 /23:33109 /24:186616
/25:1082 /26:1272 /27:711 /28:162 /29:8 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2242 3640 bellsouth.net, inc.
18566 1838 1875 Covad Communications
6478 1670 1716 AT&T Worldnet Services
10620 1402 1512 TVCABLE BOGOTA
23456 1283 2611 32-bit ASN transition
11492 1107 1153 Cable One
7011 1062 1161 Citizens Utilities
1785 1050 1790 PaeTec Communications, Inc.
4323 889 1977 Time Warner Telecom
22773 853 1338 Cox Communications, Inc.

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

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

1:282 2:48 4:16 5:1 6:3 8:338
12:1981 13:1 14:460 15:15 16:3 17:8
20:10 23:11 24:1613 27:765 31:419 32:60
33:4 34:2 37:1 38:738 40:102 41:2529
42:6 44:3 46:935 47:3 49:198 50:435
52:13 54:2 55:3 56:2 57:29 58:841
59:475 60:387 61:1121 62:1048 63:1936 64:3944
65:2289 66:4146 67:1868 68:1091 69:2978 70:704
71:351 72:1883 73:1 74:2356 75:306 76:341
77:875 78:702 79:459 80:1091 81:835 82:492
83:440 84:665 85:1069 86:591 87:751 88:331
89:1531 90:203 91:3806 92:524 93:1050 94:1287
95:821 96:506 97:250 98:858 99:35 101:60
103:51 106:1 107:7 108:85 109:955 110:598
111:709 112:304 113:403 114:536 115:680 116:954
117:692 118:796 119:1131 120:312 121:671 122:1625
123:951 124:1270 125:1215 128:261 129:173 130:162
131:573 132:108 133:19 134:213 135:48 136:210
137:144 138:299 139:109 140:480 141:239 142:403
143:401 144:489 145:54 146:440 147:210 148:596
149:244 150:171 151:184 152:328 153:179 154:3
155:397 156:198 157:352 158:138 159:380 160:316
161:207 162:281 163:164 164:501 165:352 166:515
167:426 168:719 169:155 170:801 171:77 172:1
173:1562 174:552 175:370 176:130 177:147 178:994
180:849 181:18 182:458 183:212 184:294 185:1
186:1213 187:776 188:846 189:896 190:4863 192:5844
193:4903 194:3495 195:3002 196:1225 197:19 198:3574
199:3919 200:5540 201:1479 202:8267 203:8341 204:4180
205:2319 206:2685 207:2875 208:3975 209:3476 210:2713
211:1400 212:2011 213:1737 214:732 215:72 216:4945
217:1634 218:547 219:363 220:1204 221:490 222:316
223:150

End of report
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