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, May 19, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 20 May, 2011

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

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

BGP routing table entries examined: 357556
Prefixes after maximum aggregation: 161936
Deaggregation factor: 2.21
Unique aggregates announced to Internet: 176684
Total ASes present in the Internet Routing Table: 37628
Prefixes per ASN: 9.50
Origin-only ASes present in the Internet Routing Table: 31437
Origin ASes announcing only one prefix: 15109
Transit ASes present in the Internet Routing Table: 5104
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: 642
Unregistered ASNs in the Routing Table: 333
Number of 32-bit ASNs allocated by the RIRs: 1362
Number of 32-bit ASNs visible in the Routing Table: 1087
Prefixes from 32-bit ASNs in the Routing Table: 2440
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 173
Number of addresses announced to Internet: 2432586032
Equivalent to 144 /8s, 254 /16s and 81 /24s
Percentage of available address space announced: 65.6
Percentage of allocated address space announced: 65.6
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 90.9
Total number of prefixes smaller than registry allocations: 148441

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

Prefixes being announced by APNIC Region ASes: 89549
Total APNIC prefixes after maximum aggregation: 30018
APNIC Deaggregation factor: 2.98
Prefixes being announced from the APNIC address blocks: 85910
Unique aggregates announced from the APNIC address blocks: 36691
APNIC Region origin ASes present in the Internet Routing Table: 4454
APNIC Prefixes per ASN: 19.29
APNIC Region origin ASes announcing only one prefix: 1234
APNIC Region transit ASes present in the Internet Routing Table: 709
Average APNIC Region AS path length visible: 4.6
Max APNIC Region AS path length visible: 19
Number of APNIC region 32-bit ASNs visible in the Routing Table: 47
Number of APNIC addresses announced to Internet: 615164592
Equivalent to 36 /8s, 170 /16s and 170 /24s
Percentage of available APNIC address space announced: 78.0

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: 140360
Total ARIN prefixes after maximum aggregation: 71550
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 112565
Unique aggregates announced from the ARIN address blocks: 45584
ARIN Region origin ASes present in the Internet Routing Table: 14380
ARIN Prefixes per ASN: 7.83
ARIN Region origin ASes announcing only one prefix: 5495
ARIN Region transit ASes present in the Internet Routing Table: 1501
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: 801655552
Equivalent to 47 /8s, 200 /16s and 75 /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: 84460
Total RIPE prefixes after maximum aggregation: 48240
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 77939
Unique aggregates announced from the RIPE address blocks: 51560
RIPE Region origin ASes present in the Internet Routing Table: 15619
RIPE Prefixes per ASN: 4.99
RIPE Region origin ASes announcing only one prefix: 7817
RIPE Region transit ASes present in the Internet Routing Table: 2461
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: 805
Number of RIPE addresses announced to Internet: 472497408
Equivalent to 28 /8s, 41 /16s and 189 /24s
Percentage of available RIPE address space announced: 76.1

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: 32642
Total LACNIC prefixes after maximum aggregation: 7484
LACNIC Deaggregation factor: 4.36
Prefixes being announced from the LACNIC address blocks: 31679
Unique aggregates announced from the LACNIC address blocks: 16744
LACNIC Region origin ASes present in the Internet Routing Table: 1452
LACNIC Prefixes per ASN: 21.82
LACNIC Region origin ASes announcing only one prefix: 429
LACNIC Region transit ASes present in the Internet Routing Table: 267
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: 218
Number of LACNIC addresses announced to Internet: 83511808
Equivalent to 4 /8s, 250 /16s and 74 /24s
Percentage of available LACNIC address space announced: 55.3

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: 7891
Total AfriNIC prefixes after maximum aggregation: 1877
AfriNIC Deaggregation factor: 4.20
Prefixes being announced from the AfriNIC address blocks: 6214
Unique aggregates announced from the AfriNIC address blocks: 1914
AfriNIC Region origin ASes present in the Internet Routing Table: 450
AfriNIC Prefixes per ASN: 13.81
AfriNIC Region origin ASes announcing only one prefix: 134
AfriNIC Region transit ASes present in the Internet Routing Table: 100
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: 23082240
Equivalent to 1 /8s, 96 /16s and 53 /24s
Percentage of available AfriNIC address space announced: 34.4

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 2454 9493 917 Korea Telecom (KIX)
17974 1830 516 32 PT TELEKOMUNIKASI INDONESIA
7545 1554 301 85 TPG Internet Pty Ltd
4755 1472 635 169 TATA Communications formerly
24560 1153 336 184 Bharti Airtel Ltd., Telemedia
7552 1124 1064 7 Vietel Corporation
4808 1079 2141 298 CNCGROUP IP network: China169
9583 1075 79 508 Sify Limited
9829 1039 874 51 BSNL National Internet Backbo
18101 935 116 142 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 3646 3822 255 bellsouth.net, inc.
4323 1979 1081 397 Time Warner Telecom
18566 1809 351 256 Covad Communications
1785 1787 681 124 PaeTec Communications, Inc.
6478 1688 314 54 AT&T Worldnet Services
20115 1535 1540 633 Charter Communications
19262 1496 4943 300 Verizon Global Networks
7018 1363 7069 889 AT&T WorldNet Services
22773 1330 2897 88 Cox Communications, Inc.
11492 1279 240 15 Cable One

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 520 1780 321 UPC Distribution Services
34984 512 106 182 BILISIM TELEKOM
3292 460 2062 395 TDC Tele Danmark
20940 456 134 350 Akamai Technologies European
29049 453 33 44 AzerSat LLC.
8866 444 134 26 Bulgarian Telecommunication C
12479 432 577 6 Uni2 Autonomous System
3320 425 8153 370 Deutsche Telekom AG
8551 406 355 45 Bezeq International
702 395 1802 309 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 1481 273 154 TVCABLE BOGOTA
28573 1314 991 86 NET Servicos de Comunicao S.A
8151 1257 2702 362 UniNet S.A. de C.V.
7303 925 470 149 Telecom Argentina Stet-France
6503 729 354 73 AVANTEL, S.A.
14420 668 54 90 CORPORACION NACIONAL DE TELEC
22047 556 310 15 VTR PUNTO NET S.A.
3816 521 227 100 Empresa Nacional de Telecomun
13489 509 254 116 Orbitel S.A. E.S.P.
11172 493 84 83 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
8452 894 445 11 TEDATA
24863 787 147 37 LINKdotNET AS number
15475 415 90 8 Nile Online
36992 288 331 17 Etisalat MISR
3741 268 985 228 The Internet Solution
6713 241 215 13 Itissalat Al-MAGHRIB
33776 217 12 11 Starcomms Nigeria Limited
24835 211 78 10 RAYA Telecom - Egypt
29571 162 17 11 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 3646 3822 255 bellsouth.net, inc.
4766 2454 9493 917 Korea Telecom (KIX)
23456 2440 630 1336 32-bit ASN transition
4323 1979 1081 397 Time Warner Telecom
17974 1830 516 32 PT TELEKOMUNIKASI INDONESIA
18566 1809 351 256 Covad Communications
1785 1787 681 124 PaeTec Communications, Inc.
6478 1688 314 54 AT&T Worldnet Services
7545 1554 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
17974 1830 1798 PT TELEKOMUNIKASI INDONESIA
1785 1787 1663 PaeTec Communications, Inc.
6478 1688 1634 AT&T Worldnet Services
4323 1979 1582 Time Warner Telecom
18566 1809 1553 Covad Communications
4766 2454 1537 Korea Telecom (KIX)
7545 1554 1469 TPG Internet Pty Ltd
10620 1481 1327 TVCABLE BOGOTA
4755 1472 1303 TATA Communications formerly
11492 1279 1264 Cable One

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 /11:79 /12:226
/13:461 /14:793 /15:1393 /16:11759 /17:5810 /18:9721
/19:19322 /20:25651 /21:25892 /22:34239 /23:32947 /24:186090
/25:1090 /26:1281 /27:711 /28:15 /29:8 /30:2
/31:0 /32:6

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

ASN No of nets Total ann. Description
6389 2246 3646 bellsouth.net, inc.
18566 1774 1809 Covad Communications
6478 1642 1688 AT&T Worldnet Services
10620 1371 1481 TVCABLE BOGOTA
11492 1225 1279 Cable One
23456 1197 2440 32-bit ASN transition
7011 1060 1159 Citizens Utilities
1785 1052 1787 PaeTec Communications, Inc.
4323 889 1979 Time Warner Telecom
22773 846 1330 Cox Communications, Inc.

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

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

1:271 2:40 4:14 5:1 6:3 8:353
12:1990 13:1 14:457 15:15 16:3 17:8
20:10 23:7 24:1643 27:751 31:343 32:60
33:4 34:2 37:1 38:739 40:101 41:2535
42:5 44:3 46:916 47:4 49:193 50:411
52:13 55:8 56:2 57:30 58:845 59:482
60:387 61:1248 62:960 63:1935 64:3935 65:2291
66:4145 67:1846 68:1091 69:2988 70:705 71:352
72:1879 73:1 74:2350 75:309 76:342 77:867
78:710 79:464 80:1096 81:819 82:491 83:447
84:629 85:1066 86:586 87:749 88:324 89:1555
90:204 91:3763 92:516 93:1054 94:1264 95:809
96:504 97:248 98:835 99:35 101:59 103:12
106:1 107:7 108:85 109:947 110:603 111:715
112:320 113:400 114:534 115:666 116:958 117:691
118:822 119:1139 120:308 121:676 122:1626 123:1078
124:1265 125:1227 128:262 129:176 130:164 131:571
132:108 133:19 134:217 135:49 136:216 137:142
138:304 139:112 140:482 141:239 142:402 143:407
144:481 145:54 146:442 147:214 148:592 149:243
150:172 151:186 152:310 153:178 154:3 155:396
156:194 157:352 158:135 159:387 160:319 161:207
162:279 163:163 164:501 165:353 166:507 167:431
168:730 169:153 170:795 171:77 172:1 173:1565
174:550 175:374 177:117 178:915 180:841 181:17
182:444 183:207 184:270 185:1 186:1170 187:735
188:839 189:898 190:4788 192:5788 193:4850 194:3480
195:2985 196:1221 197:19 198:3581 199:3904 200:5535
201:1483 202:8371 203:8460 204:4155 205:2324 206:2729
207:2914 208:3967 209:3447 210:2736 211:1392 212:1985
213:1732 214:728 215:70 216:4858 217:1626 218:562
219:358 220:1200 221:484 222:341 223:147

End of report
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