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.

Thursday, June 16, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 17 Jun, 2011

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

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

BGP routing table entries examined: 360182
Prefixes after maximum aggregation: 163166
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 178833
Total ASes present in the Internet Routing Table: 37903
Prefixes per ASN: 9.50
Origin-only ASes present in the Internet Routing Table: 31614
Origin ASes announcing only one prefix: 15178
Transit ASes present in the Internet Routing Table: 5134
Transit-only ASes present in the Internet Routing Table: 135
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 33
Max AS path prepend of ASN (48687) 24
Prefixes from unregistered ASNs in the Routing Table: 811
Unregistered ASNs in the Routing Table: 436
Number of 32-bit ASNs allocated by the RIRs: 1459
Number of 32-bit ASNs visible in the Routing Table: 1155
Prefixes from 32-bit ASNs in the Routing Table: 2661
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 140
Number of addresses announced to Internet: 2488905024
Equivalent to 148 /8s, 89 /16s and 173 /24s
Percentage of available address space announced: 67.2
Percentage of allocated address space announced: 67.2
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: 150308

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

Prefixes being announced by APNIC Region ASes: 89288
Total APNIC prefixes after maximum aggregation: 30132
APNIC Deaggregation factor: 2.96
Prefixes being announced from the APNIC address blocks: 85776
Unique aggregates announced from the APNIC address blocks: 36831
APNIC Region origin ASes present in the Internet Routing Table: 4485
APNIC Prefixes per ASN: 19.13
APNIC Region origin ASes announcing only one prefix: 1249
APNIC Region transit ASes present in the Internet Routing Table: 706
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: 46
Number of APNIC addresses announced to Internet: 620283424
Equivalent to 36 /8s, 248 /16s and 198 /24s
Percentage of available APNIC address space announced: 78.7

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: 141189
Total ARIN prefixes after maximum aggregation: 71792
ARIN Deaggregation factor: 1.97
Prefixes being announced from the ARIN address blocks: 113113
Unique aggregates announced from the ARIN address blocks: 46244
ARIN Region origin ASes present in the Internet Routing Table: 14436
ARIN Prefixes per ASN: 7.84
ARIN Region origin ASes announcing only one prefix: 5509
ARIN Region transit ASes present in the Internet Routing Table: 1518
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 24
Number of ARIN region 32-bit ASNs visible in the Routing Table: 12
Number of ARIN addresses announced to Internet: 818755840
Equivalent to 48 /8s, 205 /16s and 57 /24s
Percentage of available ARIN address space announced: 65.1

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: 85692
Total RIPE prefixes after maximum aggregation: 48761
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 79151
Unique aggregates announced from the RIPE address blocks: 52423
RIPE Region origin ASes present in the Internet Routing Table: 15714
RIPE Prefixes per ASN: 5.04
RIPE Region origin ASes announcing only one prefix: 7843
RIPE Region transit ASes present in the Internet Routing Table: 2476
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 33
Number of RIPE region 32-bit ASNs visible in the Routing Table: 853
Number of RIPE addresses announced to Internet: 477477888
Equivalent to 28 /8s, 117 /16s and 188 /24s
Percentage of available RIPE address space announced: 76.9

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: 33055
Total LACNIC prefixes after maximum aggregation: 7528
LACNIC Deaggregation factor: 4.39
Prefixes being announced from the LACNIC address blocks: 32160
Unique aggregates announced from the LACNIC address blocks: 16938
LACNIC Region origin ASes present in the Internet Routing Table: 1466
LACNIC Prefixes per ASN: 21.94
LACNIC Region origin ASes announcing only one prefix: 435
LACNIC Region transit ASes present in the Internet Routing Table: 262
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: 240
Number of LACNIC addresses announced to Internet: 84919552
Equivalent to 5 /8s, 15 /16s and 197 /24s
Percentage of available LACNIC address space announced: 56.2

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: 8073
Total AfriNIC prefixes after maximum aggregation: 1966
AfriNIC Deaggregation factor: 4.11
Prefixes being announced from the AfriNIC address blocks: 6374
Unique aggregates announced from the AfriNIC address blocks: 1958
AfriNIC Region origin ASes present in the Internet Routing Table: 463
AfriNIC Prefixes per ASN: 13.77
AfriNIC Region origin ASes announcing only one prefix: 142
AfriNIC Region transit ASes present in the Internet Routing Table: 102
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: 4
Number of AfriNIC addresses announced to Internet: 24236032
Equivalent to 1 /8s, 113 /16s and 208 /24s
Percentage of available AfriNIC address space announced: 36.1

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 2457 9500 924 Korea Telecom (KIX)
17974 1559 449 42 PT TELEKOMUNIKASI INDONESIA
7545 1539 301 86 TPG Internet Pty Ltd
4755 1481 634 167 TATA Communications formerly
24560 1153 336 187 Bharti Airtel Ltd., Telemedia
7552 1143 1064 7 Vietel Corporation
9583 1079 80 510 Sify Limited
4808 1048 2090 300 CNCGROUP IP network: China169
9829 1043 879 56 BSNL National Internet Backbo
17488 950 190 101 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 3630 3819 250 bellsouth.net, inc.
4323 1960 1081 397 Time Warner Telecom
18566 1913 365 237 Covad Communications
1785 1796 681 122 PaeTec Communications, Inc.
6478 1728 319 50 AT&T Worldnet Services
20115 1525 1527 638 Charter Communications
19262 1493 4936 308 Verizon Global Networks
7018 1361 7054 887 AT&T WorldNet Services
22773 1353 2905 96 Cox Communications, Inc.
7029 1316 790 297 Alltel Information 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
34984 524 107 182 BILISIM TELEKOM
6830 513 1780 320 UPC Distribution Services
3292 466 2078 401 TDC Tele Danmark
20940 462 135 354 Akamai Technologies European
29049 449 33 46 AzerSat LLC.
8866 445 134 26 Bulgarian Telecommunication C
12479 437 593 7 Uni2 Autonomous System
3320 421 8151 368 Deutsche Telekom AG
8551 404 354 44 Bezeq International
3301 397 1839 346 TeliaNet Sweden

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 1517 278 155 TVCABLE BOGOTA
28573 1306 992 79 NET Servicos de Comunicao S.A
8151 1269 2729 363 UniNet S.A. de C.V.
7303 991 506 169 Telecom Argentina Stet-France
6503 739 354 73 AVANTEL, S.A.
14420 679 54 81 CORPORACION NACIONAL DE TELEC
22047 572 322 17 VTR PUNTO NET S.A.
3816 533 231 95 Empresa Nacional de Telecomun
7738 516 986 31 Telecomunicacoes da Bahia S.A
27947 499 53 52 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
24863 795 147 37 LINKdotNET AS number
8452 761 445 11 TEDATA
15475 526 74 8 Nile Online
36992 306 415 16 Etisalat MISR
3741 265 937 226 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
24835 211 78 10 RAYA Telecom - Egypt
29571 191 17 11 Ci Telecom Autonomous system
33776 185 11 17 Starcomms Nigeria Limited
16637 153 441 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 3630 3819 250 bellsouth.net, inc.
23456 2661 659 1447 32-bit ASN transition
4766 2457 9500 924 Korea Telecom (KIX)
4323 1960 1081 397 Time Warner Telecom
18566 1913 365 237 Covad Communications
1785 1796 681 122 PaeTec Communications, Inc.
6478 1728 319 50 AT&T Worldnet Services
17974 1559 449 42 PT TELEKOMUNIKASI INDONESIA
7545 1539 301 86 TPG Internet Pty Ltd
20115 1525 1527 638 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 1728 1678 AT&T Worldnet Services
18566 1913 1676 Covad Communications
1785 1796 1674 PaeTec Communications, Inc.
4323 1960 1563 Time Warner Telecom
4766 2457 1533 Korea Telecom (KIX)
17974 1559 1517 PT TELEKOMUNIKASI INDONESIA
7545 1539 1453 TPG Internet Pty Ltd
10620 1517 1362 TVCABLE BOGOTA
4755 1481 1314 TATA Communications formerly
22773 1353 1257 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.
31.131.248.0/22 51247 PermInterSvyaz LTD
31.132.0.0/21 9153 VAS-NET-US Autonomous System
41.190.32.0/23 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 /8:22 /9:12 /10:28 /11:81 /12:230
/13:462 /14:801 /15:1394 /16:11951 /17:5847 /18:9794
/19:19371 /20:26006 /21:26034 /22:34275 /23:33258 /24:187463
/25:1096 /26:1270 /27:729 /28:41 /29:9 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2233 3630 bellsouth.net, inc.
18566 1870 1913 Covad Communications
6478 1682 1728 AT&T Worldnet Services
10620 1407 1517 TVCABLE BOGOTA
23456 1311 2661 32-bit ASN transition
11492 1090 1136 Cable One
7029 1062 1316 Alltel Information Services,
7011 1060 1160 Citizens Utilities
1785 1050 1796 PaeTec Communications, Inc.
4323 871 1960 Time Warner Telecom

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

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

1:286 2:45 4:16 5:1 6:3 8:334
12:1976 13:1 14:463 15:15 16:3 17:8
20:10 23:11 24:1653 27:788 31:443 32:64
33:4 34:2 37:1 38:733 40:103 41:2484
42:2 44:3 46:973 47:3 49:187 50:409
52:13 54:2 55:5 56:2 57:32 58:849
59:475 60:387 61:1122 62:1049 63:1933 64:3944
65:2254 66:4141 67:1888 68:1088 69:3021 70:724
71:377 72:1850 74:2370 75:319 76:340 77:880
78:707 79:460 80:1113 81:848 82:493 83:461
84:668 85:1082 86:581 87:756 88:333 89:1529
90:208 91:3858 92:513 93:1047 94:1310 95:836
96:445 97:250 98:886 99:36 101:70 103:75
106:6 107:13 108:84 109:1005 110:606 111:710
112:299 113:398 114:540 115:668 116:961 117:677
118:790 119:1143 120:309 121:669 122:1628 123:942
124:1267 125:1225 128:247 129:174 130:165 131:579
132:111 133:16 134:214 135:48 136:214 137:138
138:300 139:113 140:479 141:238 142:403 143:415
144:491 145:54 146:443 147:213 148:606 149:247
150:173 151:190 152:332 153:180 154:4 155:399
156:195 157:353 158:137 159:381 160:319 161:208
162:314 163:165 164:499 165:352 166:532 167:423
168:740 169:157 170:839 171:77 172:1 173:1621
174:601 175:362 176:135 177:166 178:996 180:887
181:19 182:474 183:218 184:303 185:1 186:1234
187:745 188:847 189:907 190:4892 192:5852 193:4956
194:3491 195:3030 196:1221 197:22 198:3597 199:3941
200:5513 201:1478 202:8311 203:8400 204:4189 205:2342
206:2686 207:2812 208:3928 209:3458 210:2680 211:1421
212:2017 213:1726 214:771 215:69 216:4924 217:1649
218:545 219:364 220:1203 221:493 222:334 223:160


End of report
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