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.

Monday, June 6, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Tue 07 Jun, 2011

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

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

BGP routing table entries examined: 358569
Prefixes after maximum aggregation: 162595
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 178244
Total ASes present in the Internet Routing Table: 37778
Prefixes per ASN: 9.49
Origin-only ASes present in the Internet Routing Table: 31545
Origin ASes announcing only one prefix: 15159
Transit ASes present in the Internet Routing Table: 5100
Transit-only ASes present in the Internet Routing Table: 134
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: 752
Unregistered ASNs in the Routing Table: 399
Number of 32-bit ASNs allocated by the RIRs: 1431
Number of 32-bit ASNs visible in the Routing Table: 1133
Prefixes from 32-bit ASNs in the Routing Table: 2618
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 164
Number of addresses announced to Internet: 2467883712
Equivalent to 147 /8s, 24 /16s and 234 /24s
Percentage of available address space announced: 66.6
Percentage of allocated address space announced: 66.6
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: 149527

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

Prefixes being announced by APNIC Region ASes: 88805
Total APNIC prefixes after maximum aggregation: 30133
APNIC Deaggregation factor: 2.95
Prefixes being announced from the APNIC address blocks: 85279
Unique aggregates announced from the APNIC address blocks: 36710
APNIC Region origin ASes present in the Internet Routing Table: 4471
APNIC Prefixes per ASN: 19.07
APNIC Region origin ASes announcing only one prefix: 1252
APNIC Region transit ASes present in the Internet Routing Table: 701
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: 619802144
Equivalent to 36 /8s, 241 /16s and 110 /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: 140442
Total ARIN prefixes after maximum aggregation: 71546
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 112508
Unique aggregates announced from the ARIN address blocks: 46169
ARIN Region origin ASes present in the Internet Routing Table: 14410
ARIN Prefixes per ASN: 7.81
ARIN Region origin ASes announcing only one prefix: 5502
ARIN Region transit ASes present in the Internet Routing Table: 1509
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: 818329856
Equivalent to 48 /8s, 198 /16s and 185 /24s
Percentage of available ARIN address space announced: 65.0

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: 85322
Total RIPE prefixes after maximum aggregation: 48563
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 78750
Unique aggregates announced from the RIPE address blocks: 52123
RIPE Region origin ASes present in the Internet Routing Table: 15661
RIPE Prefixes per ASN: 5.03
RIPE Region origin ASes announcing only one prefix: 7833
RIPE Region transit ASes present in the Internet Routing Table: 2460
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: 836
Number of RIPE addresses announced to Internet: 475548416
Equivalent to 28 /8s, 88 /16s and 75 /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: 33118
Total LACNIC prefixes after maximum aggregation: 7513
LACNIC Deaggregation factor: 4.41
Prefixes being announced from the LACNIC address blocks: 32206
Unique aggregates announced from the LACNIC address blocks: 16932
LACNIC Region origin ASes present in the Internet Routing Table: 1461
LACNIC Prefixes per ASN: 22.04
LACNIC Region origin ASes announcing only one prefix: 433
LACNIC Region transit ASes present in the Internet Routing Table: 263
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: 84646400
Equivalent to 5 /8s, 11 /16s and 154 /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: 8039
Total AfriNIC prefixes after maximum aggregation: 1916
AfriNIC Deaggregation factor: 4.20
Prefixes being announced from the AfriNIC address blocks: 6364
Unique aggregates announced from the AfriNIC address blocks: 1934
AfriNIC Region origin ASes present in the Internet Routing Table: 458
AfriNIC Prefixes per ASN: 13.90
AfriNIC Region origin ASes announcing only one prefix: 139
AfriNIC Region transit ASes present in the Internet Routing Table: 101
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)
17974 1546 441 38 PT TELEKOMUNIKASI INDONESIA
7545 1537 301 85 TPG Internet Pty Ltd
4755 1450 634 164 TATA Communications formerly
24560 1155 337 187 Bharti Airtel Ltd., Telemedia
7552 1141 1064 7 Vietel Corporation
9583 1081 80 509 Sify Limited
4808 1051 2097 299 CNCGROUP IP network: China169
9829 1041 878 59 BSNL National Internet Backbo
18101 933 116 140 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 3639 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 1473 4887 333 Verizon Global Networks
7018 1361 7068 891 AT&T WorldNet Services
22773 1338 2897 88 Cox Communications, Inc.
2386 1269 536 912 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
20940 458 134 350 Akamai Technologies European
29049 451 33 48 AzerSat LLC.
8866 445 134 26 Bulgarian Telecommunication C
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 1383 2726 362 UniNet S.A. de C.V.
28573 1322 992 86 NET Servicos de Comunicao S.A
7303 962 505 154 Telecom Argentina Stet-France
6503 735 354 73 AVANTEL, S.A.
14420 675 54 89 CORPORACION NACIONAL DE TELEC
22047 564 310 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
24863 793 147 37 LINKdotNET AS number
8452 776 445 11 TEDATA
15475 544 90 8 Nile Online
36992 291 399 14 Etisalat MISR
3741 264 937 225 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
33776 217 12 11 Starcomms Nigeria Limited
24835 210 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 3639 3822 256 bellsouth.net, inc.
23456 2618 645 1415 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
17974 1546 441 38 PT TELEKOMUNIKASI INDONESIA
7545 1537 301 85 TPG Internet Pty Ltd
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 1546 1508 PT TELEKOMUNIKASI INDONESIA
7545 1537 1452 TPG Internet Pty Ltd
10620 1512 1355 TVCABLE BOGOTA
4755 1450 1286 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 /8:21 /9:12 /10:28 /11:81 /12:228
/13:461 /14:798 /15:1395 /16:11914 /17:5843 /18:9769
/19:19333 /20:25720 /21:25943 /22:34117 /23:33099 /24:186560
/25:1082 /26:1272 /27:711 /28:166 /29:8 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2241 3639 bellsouth.net, inc.
18566 1838 1875 Covad Communications
6478 1670 1716 AT&T Worldnet Services
10620 1402 1512 TVCABLE BOGOTA
23456 1287 2618 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)
----------------------------------------------

1:281 2:49 4:16 5:1 6:3 8:337
12:1979 13:1 14:460 15:15 16:3 17:8
20:10 23:11 24:1606 27:763 31:424 32:60
33:4 34:2 37:1 38:738 40:102 41:2523
42:6 44:3 46:938 47:3 49:198 50:435
52:13 54:2 55:3 56:2 57:29 58:841
59:469 60:387 61:1121 62:1048 63:1934 64:3934
65:2249 66:4140 67:1862 68:1092 69:2983 70:704
71:352 72:1846 73:1 74:2354 75:305 76:340
77:882 78:702 79:459 80:1088 81:830 82:493
83:463 84:667 85:1073 86:592 87:745 88:331
89:1532 90:203 91:3810 92:524 93:1047 94:1286
95:817 96:506 97:251 98:858 99:35 101:63
103:51 106:1 107:7 108:85 109:967 110:598
111:706 112:303 113:403 114:536 115:680 116:959
117:686 118:796 119:1139 120:311 121:666 122:1623
123:952 124:1271 125:1218 128:261 129:171 130:164
131:572 132:108 133:19 134:213 135:48 136:210
137:144 138:300 139:109 140:479 141:237 142:401
143:406 144:489 145:54 146:444 147:214 148:599
149:246 150:173 151:184 152:328 153:179 154:3
155:398 156:198 157:352 158:138 159:380 160:315
161:205 162:281 163:164 164:500 165:353 166:515
167:427 168:724 169:155 170:805 171:77 172:1
173:1562 174:554 175:369 176:130 177:147 178:997
180:850 181:18 182:458 183:211 184:293 185:1
186:1214 187:770 188:842 189:893 190:4855 192:5846
193:4913 194:3497 195:3001 196:1231 197:19 198:3591
199:3921 200:5529 201:1475 202:8277 203:8339 204:4181
205:2318 206:2689 207:2875 208:3964 209:3473 210:2710
211:1400 212:2009 213:1736 214:735 215:72 216:4941
217:1635 218:547 219:363 220:1204 221:491 222:315
223:150

End of report
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