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, July 21, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 22 Jul, 2011

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

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

BGP routing table entries examined: 364395
Prefixes after maximum aggregation: 165596
Deaggregation factor: 2.20
Unique aggregates announced to Internet: 180736
Total ASes present in the Internet Routing Table: 38227
Prefixes per ASN: 9.53
Origin-only ASes present in the Internet Routing Table: 31772
Origin ASes announcing only one prefix: 15276
Transit ASes present in the Internet Routing Table: 5187
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: 34
Max AS path prepend of ASN (22394) 31
Prefixes from unregistered ASNs in the Routing Table: 938
Unregistered ASNs in the Routing Table: 547
Number of 32-bit ASNs allocated by the RIRs: 1583
Number of 32-bit ASNs visible in the Routing Table: 1268
Prefixes from 32-bit ASNs in the Routing Table: 2907
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 119
Number of addresses announced to Internet: 2483398208
Equivalent to 148 /8s, 5 /16s and 166 /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: 91.1
Total number of prefixes smaller than registry allocations: 151925

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

Prefixes being announced by APNIC Region ASes: 91189
Total APNIC prefixes after maximum aggregation: 30330
APNIC Deaggregation factor: 3.01
Prefixes being announced from the APNIC address blocks: 87764
Unique aggregates announced from the APNIC address blocks: 37356
APNIC Region origin ASes present in the Internet Routing Table: 4513
APNIC Prefixes per ASN: 19.45
APNIC Region origin ASes announcing only one prefix: 1254
APNIC Region transit ASes present in the Internet Routing Table: 712
Average APNIC Region AS path length visible: 4.4
Max APNIC Region AS path length visible: 18
Number of APNIC region 32-bit ASNs visible in the Routing Table: 61
Number of APNIC addresses announced to Internet: 622439968
Equivalent to 37 /8s, 25 /16s and 174 /24s
Percentage of available APNIC address space announced: 78.9

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: 141561
Total ARIN prefixes after maximum aggregation: 73157
ARIN Deaggregation factor: 1.94
Prefixes being announced from the ARIN address blocks: 113471
Unique aggregates announced from the ARIN address blocks: 46661
ARIN Region origin ASes present in the Internet Routing Table: 14495
ARIN Prefixes per ASN: 7.83
ARIN Region origin ASes announcing only one prefix: 5553
ARIN Region transit ASes present in the Internet Routing Table: 1529
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 34
Number of ARIN region 32-bit ASNs visible in the Routing Table: 13
Number of ARIN addresses announced to Internet: 802579840
Equivalent to 47 /8s, 214 /16s and 101 /24s
Percentage of available ARIN address space announced: 63.8

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: 86566
Total RIPE prefixes after maximum aggregation: 49278
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 79963
Unique aggregates announced from the RIPE address blocks: 52917
RIPE Region origin ASes present in the Internet Routing Table: 15802
RIPE Prefixes per ASN: 5.06
RIPE Region origin ASes announcing only one prefix: 7870
RIPE Region transit ASes present in the Internet Routing Table: 2497
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: 922
Number of RIPE addresses announced to Internet: 483831424
Equivalent to 28 /8s, 214 /16s and 174 /24s
Percentage of available RIPE address space announced: 77.9

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: 33770
Total LACNIC prefixes after maximum aggregation: 7637
LACNIC Deaggregation factor: 4.42
Prefixes being announced from the LACNIC address blocks: 32879
Unique aggregates announced from the LACNIC address blocks: 17109
LACNIC Region origin ASes present in the Internet Routing Table: 1489
LACNIC Prefixes per ASN: 22.08
LACNIC Region origin ASes announcing only one prefix: 447
LACNIC Region transit ASes present in the Internet Routing Table: 275
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: 268
Number of LACNIC addresses announced to Internet: 86160896
Equivalent to 5 /8s, 34 /16s and 182 /24s
Percentage of available LACNIC address space announced: 57.1

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: 8224
Total AfriNIC prefixes after maximum aggregation: 1971
AfriNIC Deaggregation factor: 4.17
Prefixes being announced from the AfriNIC address blocks: 6521
Unique aggregates announced from the AfriNIC address blocks: 2005
AfriNIC Region origin ASes present in the Internet Routing Table: 475
AfriNIC Prefixes per ASN: 13.73
AfriNIC Region origin ASes announcing only one prefix: 152
AfriNIC Region transit ASes present in the Internet Routing Table: 102
Average AfriNIC Region AS path length visible: 4.7
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: 24451584
Equivalent to 1 /8s, 117 /16s and 26 /24s
Percentage of available AfriNIC address space announced: 36.4

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 2470 11044 938 Korea Telecom (KIX)
17974 1790 508 32 PT TELEKOMUNIKASI INDONESIA
7545 1555 301 85 TPG Internet Pty Ltd
4755 1507 635 171 TATA Communications formerly
7552 1298 1064 7 Vietel Corporation
24560 1155 336 187 Bharti Airtel Ltd., Telemedia
9829 1108 923 47 BSNL National Internet Backbo
9583 1062 77 503 Sify Limited
4808 1049 2092 299 CNCGROUP IP network: China169
17488 965 187 106 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 3607 3818 238 bellsouth.net, inc.
18566 1913 365 241 Covad Communications
1785 1810 681 122 PaeTec Communications, Inc.
4323 1615 1082 401 Time Warner Telecom
20115 1589 1537 625 Charter Communications
19262 1411 4760 391 Verizon Global Networks
7018 1365 7069 892 AT&T WorldNet Services
22773 1353 2897 89 Cox Communications, Inc.
7029 1290 791 303 Windstream Communications Inc
2386 1258 520 907 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
34984 534 106 185 BILISIM TELEKOM
6830 511 1788 316 UPC Distribution Services
3292 468 2078 403 TDC Tele Danmark
20940 459 132 354 Akamai Technologies European
12479 455 593 7 Uni2 Autonomous System
8866 450 133 25 Bulgarian Telecommunication C
29049 432 32 47 AzerSat LLC.
3320 424 8151 370 Deutsche Telekom AG
8551 403 354 44 Bezeq International
702 397 1802 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 1559 287 163 TVCABLE BOGOTA
8151 1420 2746 351 UniNet S.A. de C.V.
28573 1283 995 78 NET Servicos de Comunicao S.A
7303 1009 513 178 Telecom Argentina Stet-France
6503 750 354 74 AVANTEL, S.A.
14420 699 56 84 CORPORACION NACIONAL DE TELEC
22047 578 322 17 VTR PUNTO NET S.A.
3816 533 232 97 Empresa Nacional de Telecomun
7738 516 986 31 Telecomunicacoes da Bahia S.A
27947 509 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 817 445 11 TEDATA
24863 793 147 42 LINKdotNET AS number
15475 512 74 8 Nile Online
36992 314 415 15 Etisalat MISR
3741 262 937 223 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
33776 226 13 5 Starcomms Nigeria Limited
24835 178 78 10 RAYA Telecom - Egypt
29571 158 17 11 Ci Telecom Autonomous system
15706 149 32 6 Sudatel Internet Exchange Aut

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 3607 3818 238 bellsouth.net, inc.
23456 2907 709 1568 32-bit ASN transition
4766 2470 11044 938 Korea Telecom (KIX)
18566 1913 365 241 Covad Communications
1785 1810 681 122 PaeTec Communications, Inc.
17974 1790 508 32 PT TELEKOMUNIKASI INDONESIA
4323 1615 1082 401 Time Warner Telecom
20115 1589 1537 625 Charter Communications
10620 1559 287 163 TVCABLE BOGOTA
7545 1555 301 85 TPG Internet Pty Ltd

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 1790 1758 PT TELEKOMUNIKASI INDONESIA
1785 1810 1688 PaeTec Communications, Inc.
18566 1913 1672 Covad Communications
4766 2470 1532 Korea Telecom (KIX)
7545 1555 1470 TPG Internet Pty Ltd
10620 1559 1396 TVCABLE BOGOTA
23456 2907 1339 32-bit ASN transition
4755 1507 1336 TATA Communications formerly
7552 1298 1291 Vietel Corporation
22773 1353 1264 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
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 /8:20 /9:12 /10:27 /11:80 /12:232
/13:465 /14:797 /15:1397 /16:12010 /17:5884 /18:9835
/19:19530 /20:26169 /21:26249 /22:34913 /23:33801 /24:189649
/25:1088 /26:1273 /27:741 /28:206 /29:9 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2228 3607 bellsouth.net, inc.
18566 1869 1913 Covad Communications
10620 1454 1559 TVCABLE BOGOTA
23456 1435 2907 32-bit ASN transition
11492 1095 1141 Cable One
7011 1056 1158 Citizens Utilities
1785 1055 1810 PaeTec Communications, Inc.
7029 1037 1290 Windstream Communications Inc
6478 1013 1042 AT&T Worldnet Services
22773 868 1353 Cox Communications, Inc.

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

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

1:327 2:46 4:16 5:1 6:3 8:338
12:1965 13:1 14:488 15:15 16:3 17:5
20:10 23:14 24:1678 27:839 31:505 32:64
33:4 34:2 36:4 38:746 40:104 41:2590
42:34 44:3 46:1042 47:3 49:201 50:383
52:13 54:2 55:7 56:2 57:35 58:860
59:481 60:385 61:1180 62:1033 63:1933 64:3987
65:2297 66:3866 67:1873 68:1108 69:3049 70:761
71:387 72:1886 74:2415 75:316 76:341 77:890
78:710 79:463 80:1112 81:838 82:498 83:464
84:690 85:1063 86:519 87:764 88:333 89:1533
90:224 91:3962 92:524 93:1053 94:1348 95:859
96:418 97:262 98:891 99:37 101:78 103:142
106:73 107:23 108:73 109:1022 110:612 111:709
112:305 113:411 114:553 115:683 116:985 117:690
118:864 119:1172 120:315 121:675 122:1608 123:970
124:1305 125:1278 128:242 129:171 130:170 131:563
132:111 133:21 134:214 135:47 136:215 137:138
138:298 139:116 140:471 141:248 142:403 143:417
144:480 145:54 146:454 147:217 148:672 149:249
150:161 151:189 152:341 153:182 154:4 155:398
156:199 157:355 158:140 159:455 160:314 161:204
162:310 163:166 164:501 165:367 166:531 167:434
168:740 169:153 170:848 171:80 172:1 173:1605
174:610 175:382 176:143 177:158 178:997 180:902
181:23 182:506 183:212 184:345 185:1 186:1304
187:776 188:894 189:944 190:5004 192:5908 193:4977
194:3513 195:3013 196:1200 197:41 198:3570 199:3977
200:5564 201:1477 202:8391 203:8447 204:4230 205:2328
206:2669 207:2808 208:3988 209:3427 210:2682 211:1451
212:2092 213:1741 214:770 215:70 216:4944 217:1671
218:545 219:348 220:1233 221:497 222:360 223:215


End of report
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