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, October 2, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Mon 03 Oct, 2011

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

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

BGP routing table entries examined: 375640
Prefixes after maximum aggregation: 168730
Deaggregation factor: 2.23
Unique aggregates announced to Internet: 185096
Total ASes present in the Internet Routing Table: 38929
Prefixes per ASN: 9.65
Origin-only ASes present in the Internet Routing Table: 32256
Origin ASes announcing only one prefix: 15474
Transit ASes present in the Internet Routing Table: 5212
Transit-only ASes present in the Internet Routing Table: 135
Average AS path length visible in the Internet Routing Table: 4.4
Max AS path length visible: 33
Max AS path prepend of ASN (48687) 24
Prefixes from unregistered ASNs in the Routing Table: 1524
Unregistered ASNs in the Routing Table: 813
Number of 32-bit ASNs allocated by the RIRs: 1810
Number of 32-bit ASNs visible in the Routing Table: 1461
Prefixes from 32-bit ASNs in the Routing Table: 3375
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 96
Number of addresses announced to Internet: 2481620736
Equivalent to 147 /8s, 234 /16s and 135 /24s
Percentage of available address space announced: 67.0
Percentage of allocated address space announced: 67.0
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 91.5
Total number of prefixes smaller than registry allocations: 157487

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

Prefixes being announced by APNIC Region ASes: 94279
Total APNIC prefixes after maximum aggregation: 30846
APNIC Deaggregation factor: 3.06
Prefixes being announced from the APNIC address blocks: 90746
Unique aggregates announced from the APNIC address blocks: 37948
APNIC Region origin ASes present in the Internet Routing Table: 4572
APNIC Prefixes per ASN: 19.85
APNIC Region origin ASes announcing only one prefix: 1258
APNIC Region transit ASes present in the Internet Routing Table: 705
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 21
Number of APNIC region 32-bit ASNs visible in the Routing Table: 90
Number of APNIC addresses announced to Internet: 628370272
Equivalent to 37 /8s, 116 /16s and 43 /24s
Percentage of available APNIC address space announced: 79.7

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 131072-132095, 132096-133119
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: 144124
Total ARIN prefixes after maximum aggregation: 73953
ARIN Deaggregation factor: 1.95
Prefixes being announced from the ARIN address blocks: 116254
Unique aggregates announced from the ARIN address blocks: 47945
ARIN Region origin ASes present in the Internet Routing Table: 14694
ARIN Prefixes per ASN: 7.91
ARIN Region origin ASes announcing only one prefix: 5655
ARIN Region transit ASes present in the Internet Routing Table: 1561
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 25
Number of ARIN region 32-bit ASNs visible in the Routing Table: 12
Number of ARIN addresses announced to Internet: 804603136
Equivalent to 47 /8s, 245 /16s and 69 /24s
Percentage of available ARIN address space announced: 63.9

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: 90086
Total RIPE prefixes after maximum aggregation: 50437
RIPE Deaggregation factor: 1.79
Prefixes being announced from the RIPE address blocks: 82783
Unique aggregates announced from the RIPE address blocks: 54111
RIPE Region origin ASes present in the Internet Routing Table: 16003
RIPE Prefixes per ASN: 5.17
RIPE Region origin ASes announcing only one prefix: 7955
RIPE Region transit ASes present in the Internet Routing Table: 2500
Average RIPE Region AS path length visible: 4.7
Max RIPE Region AS path length visible: 33
Number of RIPE region 32-bit ASNs visible in the Routing Table: 1034
Number of RIPE addresses announced to Internet: 490078848
Equivalent to 29 /8s, 54 /16s and 2 /24s
Percentage of available RIPE address space announced: 78.9

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: 35041
Total LACNIC prefixes after maximum aggregation: 7799
LACNIC Deaggregation factor: 4.49
Prefixes being announced from the LACNIC address blocks: 34389
Unique aggregates announced from the LACNIC address blocks: 18020
LACNIC Region origin ASes present in the Internet Routing Table: 1532
LACNIC Prefixes per ASN: 22.45
LACNIC Region origin ASes announcing only one prefix: 449
LACNIC Region transit ASes present in the Internet Routing Table: 279
Average LACNIC Region AS path length visible: 4.5
Max LACNIC Region AS path length visible: 19
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 321
Number of LACNIC addresses announced to Internet: 89699200
Equivalent to 5 /8s, 88 /16s and 179 /24s
Percentage of available LACNIC address space announced: 59.4

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: 8567
Total AfriNIC prefixes after maximum aggregation: 1994
AfriNIC Deaggregation factor: 4.30
Prefixes being announced from the AfriNIC address blocks: 6635
Unique aggregates announced from the AfriNIC address blocks: 1945
AfriNIC Region origin ASes present in the Internet Routing Table: 485
AfriNIC Prefixes per ASN: 13.68
AfriNIC Region origin ASes announcing only one prefix: 157
AfriNIC Region transit ASes present in the Internet Routing Table: 103
Average AfriNIC Region AS path length visible: 4.6
Max AfriNIC Region AS path length visible: 25
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 4
Number of AfriNIC addresses announced to Internet: 27672832
Equivalent to 1 /8s, 166 /16s and 65 /24s
Percentage of available AfriNIC address space announced: 41.2

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 2510 11048 963 Korea Telecom (KIX)
17974 1999 519 33 PT TELEKOMUNIKASI INDONESIA
7545 1607 303 86 TPG Internet Pty Ltd
4755 1542 638 176 TATA Communications formerly
7552 1385 1064 7 Vietel Corporation
24560 1177 345 208 Bharti Airtel Ltd., Telemedia
9829 1158 989 28 BSNL National Internet Backbo
9583 1087 80 503 Sify Limited
4808 1074 2096 303 CNCGROUP IP network: China169
18101 952 165 142 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 3557 3817 225 bellsouth.net, inc.
18566 1915 366 239 Covad Communications
1785 1830 680 124 PaeTec Communications, Inc.
7029 1827 1008 195 Windstream Communications Inc
4323 1628 1082 391 Time Warner Telecom
20115 1595 1542 635 Charter Communications
22773 1457 2907 100 Cox Communications, Inc.
19262 1395 4728 400 Verizon Global Networks
30036 1390 252 668 Mediacom Communications Corp
7018 1339 7051 873 AT&T WorldNet Services

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
8402 1439 352 13 Corbina telecom
34984 577 108 180 BILISIM TELEKOM
6830 557 1873 333 UPC Distribution Services
20940 530 178 408 Akamai Technologies European
3320 500 8169 383 Deutsche Telekom AG
3292 479 2082 408 TDC Tele Danmark
12479 476 593 7 Uni2 Autonomous System
8866 459 133 26 Bulgarian Telecommunication C
29049 423 31 55 AzerSat LLC.
8551 404 354 44 Bezeq International

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 1681 310 155 TVCABLE BOGOTA
8151 1408 2823 346 UniNet S.A. de C.V.
28573 1368 1013 70 NET Servicos de Comunicao S.A
7303 1163 683 175 Telecom Argentina Stet-France
14420 742 58 87 CORPORACION NACIONAL DE TELEC
22047 581 322 17 VTR PUNTO NET S.A.
6503 574 450 69 AVANTEL, S.A.
27947 573 71 83 Telconet S.A
3816 529 231 103 Empresa Nacional de Telecomun
11172 522 85 94 Servicios Alestra S.A de C.V

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
24863 816 147 37 LINKdotNET AS number
8452 730 445 11 TEDATA
15475 450 74 8 Nile Online
36992 292 415 14 Etisalat MISR
3741 278 939 231 The Internet Solution
15706 244 32 6 Sudatel Internet Exchange Aut
6713 242 519 14 Itissalat Al-MAGHRIB
33776 239 13 8 Starcomms Nigeria Limited
12258 198 28 58 Vodacom Internet Company
29571 192 17 11 Ci Telecom Autonomous system

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 3557 3817 225 bellsouth.net, inc.
4766 2510 11048 963 Korea Telecom (KIX)
17974 1999 519 33 PT TELEKOMUNIKASI INDONESIA
18566 1915 366 239 Covad Communications
1785 1830 680 124 PaeTec Communications, Inc.
7029 1827 1008 195 Windstream Communications Inc
10620 1681 310 155 TVCABLE BOGOTA
4323 1628 1082 391 Time Warner Telecom
7545 1607 303 86 TPG Internet Pty Ltd
20115 1595 1542 635 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
17974 1999 1966 PT TELEKOMUNIKASI INDONESIA
1785 1830 1706 PaeTec Communications, Inc.
18566 1915 1676 Covad Communications
7029 1827 1632 Windstream Communications Inc
4766 2510 1547 Korea Telecom (KIX)
10620 1681 1526 TVCABLE BOGOTA
7545 1607 1521 TPG Internet Pty Ltd
8402 1439 1426 Corbina telecom
7552 1385 1378 Vietel Corporation
4755 1542 1366 TATA Communications formerly

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
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
17300 UNALLOCATED 12.45.103.0/24 7018 AT&T WorldNet Servic
17300 UNALLOCATED 12.45.110.0/24 701 UUNET Technologies,
16476 UNALLOCATED 12.46.27.0/24 7018 AT&T WorldNet Servic
32873 UNALLOCATED 12.46.100.0/23 10912 InterNAP Network Ser

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
41.222.79.0/24 36938 >>UNKNOWN<<
41.223.92.0/22 36936 >>UNKNOWN<<
62.61.220.0/24 24974 Tachyon Europe BV - Wireless
62.61.221.0/24 24974 Tachyon Europe BV - Wireless

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 /10:27 /11:81 /12:235
/13:464 /14:803 /15:1422 /16:11991 /17:5991 /18:10021
/19:19833 /20:27105 /21:27185 /22:36831 /23:34918 /24:195299
/25:1129 /26:1345 /27:752 /28:168 /29:4 /30:0
/31:0 /32:5

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

ASN No of nets Total ann. Description
6389 2194 3557 bellsouth.net, inc.
18566 1870 1915 Covad Communications
10620 1576 1681 TVCABLE BOGOTA
7029 1523 1827 Windstream Communications Inc
8402 1408 1439 Corbina telecom
30036 1352 1390 Mediacom Communications Corp
11492 1115 1153 Cable One
1785 1054 1830 PaeTec Communications, Inc.
7011 1052 1173 Citizens Utilities
22773 946 1457 Cox Communications, Inc.

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

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

1:378 2:477 4:15 5:1 6:3 8:354
12:1952 13:1 14:528 15:13 16:3 17:7
20:10 23:36 24:1688 27:963 31:573 32:65
33:4 34:2 36:4 38:748 40:108 41:2685
42:48 44:3 46:990 47:3 49:263 50:432
52:13 55:4 56:2 57:38 58:882 59:489
60:365 61:1176 62:1089 63:1935 64:4057 65:2305
66:3997 67:1953 68:1101 69:3202 70:829 71:377
72:1848 74:2467 75:356 76:341 77:882 78:876
79:479 80:1123 81:836 82:504 83:501 84:623
85:1118 86:407 87:876 88:352 89:1602 90:268
91:4149 92:531 93:1374 94:1317 95:1011 96:441
97:277 98:907 99:37 101:210 103:333 106:70
107:59 108:47 109:1033 110:662 111:795 112:321
113:449 114:552 115:699 116:877 117:704 118:890
119:1210 120:334 121:682 122:1606 123:1021 124:1353
125:1393 128:244 129:179 130:165 131:580 132:112
133:21 134:214 135:54 136:214 137:139 138:288
139:122 140:496 141:292 142:388 143:413 144:485
145:63 146:471 147:215 148:639 149:264 150:153
151:193 152:446 153:177 154:6 155:386 156:207
157:361 158:150 159:466 160:323 161:206 162:336
163:179 164:511 165:375 166:536 167:432 168:742
169:147 170:865 171:85 172:1 173:1651 174:650
175:413 176:265 177:290 178:1046 180:1100 181:37
182:627 183:215 184:383 185:1 186:1496 187:678
188:923 189:874 190:5184 192:5916 193:5009 194:3529
195:3080 196:1258 197:172 198:3625 199:4134 200:5507
201:1643 202:8579 203:8494 204:4258 205:2351 206:2676
207:2824 208:4039 209:3464 210:2698 211:1462 212:2046
213:1775 214:787 215:90 216:4895 217:1606 218:560
219:338 220:1227 221:505 222:342 223:262

End of report
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